I am a newbie, and plan on building a computer. I have already picked out my Case, decided on what RAM (4-512 MB 184-pin, DDR400) I will get, and that all amounts to about $300. I would appreciate suggestions on what else to get regarding my motherboard, processor, hard drive, and PSU to get if I am making this primarily for games. I would like to keep the price range in the $800's range, any suggestions? 
Here is a list of parts that I am thinking of for the comp... Does this all look compatible?
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Processor-AMD Athlon 64 X2 $250
http://www.newegg.com/Product/Product.asp?Item=N82E16819103545
^
Is there a way to get a step down from this? | I want pretty good performance, but I don't know about shelling out so much money for it >.<
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Motherboard-ASUS A8N-SLI Premium Socket 939 $133
http://www.newegg.com/Product/Product.asp?Item=N82E16813131540
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Memory-4x CORSAIR 512MB 184-Pin- $220
http://www.newegg.com/Product/Product.asp?Item=N82E16820145479
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Hard Drive-Western Digital Raptor 74 GB 10,000 RPM $160
http://www.newegg.com/Product/Product.asp?Item=N82E16822136033
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Power Supply-SILVERSTONE 12V 500 Watt Power Supply $113
http://www.newegg.com/Product/Product.asp?Item=N82E16817256008
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Case-XCLIO ATX Mid Tower $110
http://www.newegg.com/Product/Product.asp?Item=N82E16811103010
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Sound Card-Creative Sound Blaster Audigy2 $75
http://www.newegg.com/Product/Product.asp?Item=N82E16829102178
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Does someone also have any ideas for a graphics card? It needs to be fairly good (say 256 MB or so) but still be decently priced. Thanks for any help!
Here is a list of parts that I am thinking of for the comp... Does this all look compatible?
_________________________________________________________________
Processor-AMD Athlon 64 X2 $250
http://www.newegg.com/Product/Product.asp?Item=N82E16819103545
^
Is there a way to get a step down from this? | I want pretty good performance, but I don't know about shelling out so much money for it >.<
_________________________________________________________________
Motherboard-ASUS A8N-SLI Premium Socket 939 $133
http://www.newegg.com/Product/Product.asp?Item=N82E16813131540
_________________________________________________________________
Memory-4x CORSAIR 512MB 184-Pin- $220
http://www.newegg.com/Product/Product.asp?Item=N82E16820145479
_________________________________________________________________
Hard Drive-Western Digital Raptor 74 GB 10,000 RPM $160
http://www.newegg.com/Product/Product.asp?Item=N82E16822136033
_________________________________________________________________
Power Supply-SILVERSTONE 12V 500 Watt Power Supply $113
http://www.newegg.com/Product/Product.asp?Item=N82E16817256008
_________________________________________________________________
Case-XCLIO ATX Mid Tower $110
http://www.newegg.com/Product/Product.asp?Item=N82E16811103010
_________________________________________________________________
Sound Card-Creative Sound Blaster Audigy2 $75
http://www.newegg.com/Product/Product.asp?Item=N82E16829102178
_________________________________________________________________
Does someone also have any ideas for a graphics card? It needs to be fairly good (say 256 MB or so) but still be decently priced. Thanks for any help!