EVGA 512-P3-N975-TR GeForce 9800 GT 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130518 $99.99 RAIDMAX HYBRID 2 RX-530SS 530W ATX12V V2.2/ EPS12V SLI Ready CrossFire Ready Modular LED Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817152028 $54.98 CORSAIR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model TWIN2X4096-6400C5
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145184 $61.99 ASRock G31M-S LGA 775 Intel G31 Micro ATX Intel Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157146 $43.99 Intel Pentium E5200 Wolfdale 2.5GHz LGA 775 65W Dual-Core Processor Model BX80571E5200
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116072 $66.99$330.75 w/ Shipping ( A little over, but it's definitely worth it)Basically, If you get most of that and keep the other stuff (Hard drives, case, DVD drive) you have you'll have a decent gaming computer, nothing spectacular, but only thing close to your price range. You could skimp on the RAM and get it down to more what you were looking for, but anything below 4GB is borderline pathetic for games now-a-days...