Expensive Homebuilt Computer System (Possibly 2000 Dollar Quota)

Hello, I currently have an Asus AMD Athlon 3700+, A8N-VM CSM Motherboard, G. Skill 3x1GB DDR 400 (Dual Channel), HIS Sapphire x1600+ pro 512 MB, Hanns-G 27.5" LCD.

I am looking to go above and beyond, by building quite an expensive computer system that will take quite some time to fix-up (mainly due to the fact that I wanted to do watercooling). I expect by the time that I am finished with this system, I will have landed about 2 grand on it.

Before I go any further, I do have some products picked out that I am interested in as of right now. I was perhaps hoping on some inputs and remarks from other users on my products of interest. They are as follows:

1.) CPU: Intel i7 940 (I have looked at multiple benchmarks of this CPU. My only question is, how much better than is the 940 than the 920 on a scale of 1-10)

2.) Motherboard: EVGA Classified 3-way SLI+ PhysX 1366 Intel X58 Intel Motherboard (I have picked this motherboard mainly because i need a good motherboard that could take heavy overclocking; also the number of pci express 2.0x16 x4 speeds interests me. The only lacking side of this board that I see right now is that ddr3 1600 is its top speed.)

3.) Graphics Card: x2 Asus HD5870s (Will increase later if needed. As for right now, two should be well more than enough to slam and deliver)

4.) RAM: "??" No idea. The EVGA Motherboard that I have picked out requires triple channel DDR3 1600 RAM. My intents are to get the quickest, most efficient, reliable, RAM that I can get, and to stuff all six slots. Prices vary on RAM, and I am quite lost on this choice.

5.) PSU: "??" I have looked into some 1,000 Watt PSUs. Alot of them seem to be less than 90% efficient. I would like something efficient and in the 350 dollar range if need be.

6.) Sound Card: "??" I'm looking with something that has a very good signal-to-noise ratio, and something that could produce top-of-the-line sound quality. I am a big car stereo fan, and am a fanatic when it comes to sound quality.

7.) Monitor: Already own it. Hanns-G 27.5" 1080p LCD Monitor.

8.) Case: Already picked out. Xclio 2000. The large display of lights and fans has grabbed my interest greatly (especially for the overclocking that I plan on doing).

9.) WATERCOOLING: Exos-2 LX

Thank you guys on Tomshardware.com for your time!
-Infs

I would change a few things and will definitely suggest some parts for you, but first if you wouldn't mind filling this little form out, it would be most helpful (it would help me answer questions such as why you're crossfiring 5870s).

http://www.tomshardware.com/forum/ [...] ild-advice

I'm sorry but I am kind of confused by your response about the closed loop water cooling. I read an article on Tom's that spoke highly of it (was even the same water cooling system that I had picked out).

Here is the article on Tom's: http://www.tomshardware.com/review [...] ,1573.html

Okay, thank you all for your help. After reading your posts, I have come to the conclusion of:

CPU:
Intel Core i7-920 Bloomfield 2.66GHz 4 x 256KB L2 Cache
http://www.newegg.com/Product/Prod [...] 6819115202
Cost:$288

Motherboard:
ASUS P6T Deluxe V2 LGA 1366 Intel X58 ATX Intel Motherboard
http://www.newegg.com/Product/Prod [...] -_-Product
Cost: $289.99

Graphics Card:
ASUS EAH5870
http://www.newegg.com/Product/Prod [...] 6814121346
Cost: $779.98 (Two tallied-up in the price)

Memory (Short-Term):
OCZ Platinum 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
http://www.newegg.com/Product/Prod [...] 6820227381
Cost: $153.99

Memory (Long-Term):
Intel X25-M Mainstream SSDSA2MH080G2C1 2.5" 80GB SATA II MLC Internal Solid state disk
http://www.newegg.com/Product/Prod [...] 6820167016
Cost: $289.00

Hard Drive:
Seagate Barracuda 7200.12 ST31000528AS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s
http://www.newegg.com/Product/Prod [...] 6822148433
Cost: $89.99

PSU:
XFX P1850BCAG9 850W ATX12V / EPS12V SLI Ready 80 PLUS SILVER
http://www.newegg.com/Product/Prod [...] 6817207001
Cost: $179.99

Case:
XCLIO 2000 Black &Ttitanium Finish 1.0 mm SECC / ABS Plastic ATX Full Tower Extreme Cooling Computer Case
http://www.newegg.com/Product/Prod [...] lio%202000
Cost: $279.99

Watercooler:
Exos-2.5, Black [no nozzles]
http://www.koolance.com/water-cool [...] uct_id=668
Cost: $374.99

Total: Around $2726