800$ Gaming budget

If you don't want to build it yourself, you should customize it at cyberpowerpc.com or ibuypower.com. I'll get back to you tomorrow with a build. A 2500K/6850 should be doable, and it'll leave you with tons of room to upgrade.

Even if you can find one at cyperpower/ibuypower, you'll still be better off building it on your own if you are willing - this is where newegg shines (buying individual parts). It's worth the experience if you are willing to put a little bit of time into it. Saves money and you get to say that YOU built it the way YOU wanted it. It's not as hard as you would think!  

thank you

You can check out my guide here for parts, the $850 build should work for you. You can always save a bit if you want by downgrading from the 560 Ti to a 6870. I wouldn't suggest going to CyberPower or iBuyPower, both are not bad but still they aren't worth the amount they actually charge for each of the parts.
http://www.squidoo.com/electronicandmore

http://www.tomshardware.com/reviews/core-i5-overclock-p...

this build is pretty solid for just $600
however i would upgrade some parts like the case and the power supply.

I recommend the Rosewill Challenger Case and an 80plus certified PSU. I use the corsair CX600 V2.

Remember that building your computer is much better because u can get a better PC with less money.
In my case I also checked the similar performing PC's at a lot of websites and now I know I saved between $300- $450

http://www.newegg.com/Product/ComboDealDetails.aspx?Ite... - $195.98
Intel Core i5-2400 Sandy Bridge 3.1GHz (3.4GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 2000 BX80623I52400
SAMSUNG 22X DVD Burner SATA Model SH-222BB/BEBE - OEM

http://www.newegg.com/Product/Product.aspx?Item=N82E168... - $104.99
ASRock Z68 PRO3 GEN3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

http://www.newegg.com/Product/Product.aspx?Item=N82E168... - $46.99
G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL

http://www.newegg.com/Product/Product.aspx?Item=N82E168... - $84.99
Seagate Barracuda ST500DM002 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive

http://www.newegg.com/Product/Product.aspx?Item=N82E168... - $59.99 - $10MIR
COOLER MASTER HAF 912 RC-912-KKN1 Black SECC/ ABS Plastic ATX Mid Tower Computer Case

http://www.newegg.com/Product/Product.aspx?Item=N82E168... - $59.99 - $10MIR
CORSAIR Builder Series CX500 V2 500W ATX12V v2.3 80 PLUS Certified Active PFC Power Supply

http://www.newegg.com/Product/Product.aspx?Item=N82E168... - $209.99
GIGABYTE GV-N560UD-1G GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Total: $772.92 - $20MIR

Listen to them. I'm bowing out. HOMEWORK