Need some input on this 2k system

Go with the i5 2500K to save some bucks. It runs virtually as fast as the 2600K for games. You can get very nice overclocks with an air cooler and save even more money, the 2500K and 2600K both overclock a lot on a good air cooler. After reading the article on micro stuttering I would go with a single faster card instead of 2 in SLI.

Motherboard wise if you’re leaning to EVGA go for them, they offer much much much better support if anything went wrong. I have a Asus motherboard and am happy with it though.
2600k is great but what will you do that benefits from hyperthreading, do you do video editing? if not maybe 2500k (unless u just want the very best   )
16GB ram is too much IMO, 8 is more than enough these days, can always upgrade later if you feel you need.
two gtx 560 ti is better than a single 580. However with a 580 you can always sli later (expensive though). i Have Evga gtx 560 ti superclocked and am happy with it, so two will be great.
HX 1050 is a lot for a gtx 560 sli (850 is fine), however it will last multiple builds so if you’re happy with overkill that’s fine.

Are you planning to do anything intensive besides gaming? If so, the memory capacity you're going for is overkill by a factor of two, and if not, then by a factor of four. You'll get better performance for less with these:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

As has been said, you can do a lot better than SLI 560ti on that budget. From what the BF3 devs have let slip, you'll want more framebuffer than is offered by Nvidia in their value-performance line. If you go Nvidia, I'd recommend the GTX 580 as a minimum (and naturally a maximum). 6970s in CF would be a good alternative.

16GB ram = no impact on gaming.

8GB is MORE than enough.

560Ti's in SLI - OK so its better NOW than a single 580. But if in future you want to add another card, with 2 560s you need to replace both cards. If you had a 580 to begin with you could easily add another in for some INSANE performance increase.

Bottom line: If you can afford SLI straight off the bat, generally dont bother, buy the most expensive single card you can afford, SLI it later on/in a couple of years if you feel you need to.

1000w PSU - OVERKILL for 560Ti's in SLI, 750w is plenty. If you considering 580's though, stick with the 100w.

This Asrock board down below has the NF200 bride allowing for dual cards to run @ x16 & x16. It's new on the market (just came out a few days ago), and if it's anything like their other 1155 boards then it's a winner. This board also has the new PCI-E 3.0 slots for the new generation cards due out whenever.

The psu down below is manufactured by Enermax for LEPA and at that price it's a steal not to mention it gives you plenty of juice to push two of those cards.

Also keep in mind the OCZ SSD's are about as reliable as a ship with holes in it's hull hence the reason the Crucial M4's are selling off the hook atm.

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $169.99 - $159.99 after mail-in rebate FREE SHIPPING
COOLER MASTER HAF X RC-942-KKN1 Black Steel/ Plastic ATX Full Tower Computer Case

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $179.99 - $129.99 after mail-in rebate card
LEPA G900-MA 900W SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $289.99
ASRock Z68 Extreme7 Gen3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

http://www.newegg.com/Product/ComboDealDetails.aspx?Ite... $357.98 FREE SHIPPING
Intel Core i7-2600K Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor BX80623I72600K
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Profile Desktop Memory Model CML8GX3M2A1600C9

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $48.99 - $28.99 after mail-in rebate FREE SHIPPING
XIGMATEK BALDER SD1283 120mm Long Life CPU Cooler I7 i5 775 1155 AMD compatible, w/ bracket ACK-I5361

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $59.99 FREE SHIPPING
SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $489.99 - $469.99 after mail-in rebate card FREE SHIPPING
EVGA SuperClocked 015-P3-1582-AR GeForce GTX 580 (Fermi) 1536MB 384-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $19.99 FREE SHIPPING
Sony Optiarc CD/DVD Burner 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM Black SATA Model AD-7260S-0B - OEM

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $211.99 FREE SHIPPING
Crucial M4 CT128M4SSD2 2.5" 128GB SATA III MLC Internal Solid State Drive (SSD)

Total: $1,828.90 *not including shipping and rebates

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $99.99 FREE SHIPPING
Microsoft Windows 7 Home Premium SP1 64-bit - OEM

*** Dual 560ti in SLI version of that build up above

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $89.99 - $64.99 after mail-in rebate FREE SHIPPING
Antec High Current Gamer Series HCG-750 750W ATX12V v2.3 / EPS12V v2.91 SLI Certified CrossFire Certified 80 PLUS BRONZE Certified Active PFC Power Supply

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $239.99 - $219.99 after mail-in rebate card FREE SHIPPING
MSI N560GTX-Ti Twin Frozr II GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $129.99 <---- Cheaper board, o/c great and supports SLI
ASRock Z68 Extreme3 Gen3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

*** The 2600K has no advantages in any games over the 2500K other than FSX. Save some money on this combo down below.

http://www.newegg.com/Product/ComboDealDetails.aspx?Ite... $264.98 FREE SHIPPING
Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor BX80623I52500K
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Profile Desktop Memory Model CML8GX3M2A1600C9

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $27.99 FREE SHIPPING
COOLER MASTER Hyper 212 Plus RR-B10-212P-G1 "Heatpipe Direct Contact" Long Life Sleeve 120mm CPU Cooler Compatible Intel Core i5 & Intel Core i7

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $99.99 - $89.99 after mail-in rebate FREE SHIPPING
COOLER MASTER HAF 922 RC-922M-KKN1-GP Black Steel + Plastic and Mesh Bezel ATX Mid Tower Computer Case

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $19.99 FREE SHIPPING
COOLER MASTER Megaflow 200 R4-LUS-07AR-GP 200mm Red LED Case Fan

http://www.newegg.com/Product/Product.aspx?Item=N82E168... $9.86 FREE SHIPPING
COOLER MASTER R4-S4S-10AK-GP 140mm Case Fan

http://www.asrock.com/mb/overview.asp?Model=Z68%20Extre... <---- a better look at that ASRock Z68 Extreme7 Gen3

http://www.asrock.com/mb/overview.asp?Model=Z68%20Extre... <---- a better look at that ASRock Z68 Extreme3 Gen3

http://www.xtremesystems.org/forums/showthread.php?2739...**Official**-Asrock-Z68-Gen3-Extreme7-amp-Extreme4-thread

http://www.legitreviews.com/news/11080/

i5 2500k & Corsair H60- http://www.newegg.com/Product/ComboDealDetails.aspx?Ite... 257$

aftermarket fans for h60- http://www.amazon.com/Cooler-Master-120mm-Case-R4-C2R-2... 17$

P8P67 WS Revolution & Corsair Vengeance 8gb 1866mhz- http://www.newegg.com/Product/ComboDealDetails.aspx?Ite... 325$

Silverstone RV03- http://www.amazon.com/Silverstone-Extended-90-Degree-Mo... 140$

PowerColor 6950 2gb- http://www.newegg.com/Product/Product.aspx?Item=N82E168... 265$x3=795$

Samsung F3 1tb- http://www.newegg.com/Product/Product.aspx?Item=N82E168... 60$

Crucial m4 128gb- http://www.newegg.com/Product/Product.aspx?Item=N82E168... 212$

Windows 7 64 bit oem- http://www.newegg.com/Product/Product.aspx?Item=N82E168... 90$ after promo code MSFSAVE823

Silverstone 1000w PSU- http://www.amazon.com/SilverStone-ATX12V-EPS12V-Modular... 184$