Building a new system

[stratosigma]

Greetings!

I've been reading through many of the builds people here have setup and would appreciate some input on my own before I part ways with my dollars.

Main intention is a gaming rig, here's what I have so far:

Case: Antec 900 http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021
PSU: Corsair CMPSU-620HX http://www.newegg.com/Product/Product.aspx?Item=N82E16817139002
MOBO: ASUS P5Q Pro P45 http://www.newegg.com/Product/Product.aspx?Item=N82E16813131299
GPU: ASUS 512MB Radeon HD 4850 http://www.newegg.com/Product/Product.aspx?Item=N82E16814121253
CPU: Intel Q6600 http://www.newegg.com/Product/Product.aspx?Item=N82E16819115017
RAM: G.Skill 4GB (2x2GB) DDR2 800 http://www.newegg.com/Product/Product.aspx?Item=N82E16820231122
HDD: WD Caviar SE16 640GB WD6400AAKS http://www.newegg.com/Product/Product.aspx?Item=N82E16822136218

This is about the price range I'm looking for, but am willing to increase a little if the return is decent. I'm also willing to decrease the price if someone points out lower priced alternatives I may have overlooked

Also, how much of a performance hit can I expect, IF, in the future I crossfire it up knowing the P5Q caps at 8X on the PCI-E?

Thanks in advance

Edited to update my selection

 

[georgy]

http://www.legionhardware.com/document.php?id=761&p=0

 

[stratosigma]

http://www.legionhardware.com/document.php?id=761&p=0

Thanks for teh quick response, georgy. If I read those results correctly, the performance difference
between the 8x8 and 16x16 isn't worth worrying about.

 

[stratosigma]

I've replaced the HDD with the much talked about WD6400AAKS

Does anyone have any additional suggestions?

I should probably ask the case/psu is a combo deal, is 650w good enough if I decide later to throw another 4850 in there?

 

[stratosigma]

I am probably going to pull the trigger on this in the morning. If anyone has any last minute suggestions, they're appreciated