I need help building a new PC mainly to be used for gaming, so I need some critique on my system before purchase:
 
GIGABYTE GA-P35-DS3L All Solid Capacitor Motherboard - $90
http://www.newegg.com/Product/Prod [...] 6813128059
 
Intel Core 2 Duo Wolfdale (E8400) - $210  
http://www.newegg.com/Product/Prod [...] 6819115037
 
Kingston HyperX 4GB (4 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066 - $120
http://www.newegg.com/Product/Prod [...] 6820134596
 
OCZ StealthXStream ATX12V 600watt PSU - $85
http://www.newegg.com/Product/Prod [...] 6817341010
 
SeaGate Barracuda 250GB Sata/3gbs HDD (16mb Cache, 7200rpm) - $65
http://www.newegg.com/Product/Prod [...] 6822148141
 
Philips DVD+\-RW DVD Burner Drive - $25
http://www.newegg.com/Product/Prod [...] 6827248013
 
PCI-E 2.0 EVGA GeForce 8800GT 512mb - $180 after a MIR
http://www.newegg.com/Product/Prod [...] 6814130319
 
 
Total Cost: $775 or up, considering that the Wolfdale's CPU price fluctuates and this excludes shipping ($20-$40)
 
I already own a nice case, so buying another one would just be redundant considering how many extra I have, and I know that the Wolfdale is very overclockable, even on stock cooling. I have a copy of Windows Vista 64-bit, Windows XP Professional 64-bit, and Windows XP Home 32-bit laying around. I have a 24-inch flat screen monitor I got for free (lucked out on that one) too.
 
My maximum cost is $800 so I have a fairly decent budget yet it is still limited.

What are you going to be doing mainly with this pc? Gaming? If so, what games? It sounds pretty good from what you've chosen already.

I intend to use it for gaming. Since my PC downstairs has wireless, I can just hook it up for and extra 1-2 TeraBytes of file space for non-application data. I originally was trying to get a PC that would run crysis, but I'm not sure as to what this machine would do with it. I expected medium settings maybe high settings. Otherwise I have COD4 and Oblivion, but my PC now can't run them. (Yeah, a P4 with intel integrated graphics and 2gb of DDR 133 RAM. Slow as hell FTW! lol)  
 
Other than gaming, I figured the above-average quality of the CPU and RAM would make it faster in regular apps.
 
EDIT: Okay, above average for my standards, lol

Yes. But Q6600 price is around the corner with the price