Well your post didnt say what speed your ram is now, but here is a quick build from newegg. 2gb ddr2, quad core, and a decent mobo. If you already have DDR2 800, you could get a mobo that has 4 memory slots, and go for 4gb. You might even look into a mobo with a second x16 slot, in case you want more than 2 monitors someday.



SUPER TALENT 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model T800UX2GC5 - Retail Item #: N82E16820609027 Return Policy: Memory (Modules, USB) Return Policy
$39.99





GIGABYTE GA-P31-S3G LGA 775 Intel P31 ATX Intel Motherboard - Retail Item #: N82E16813128077 Return Policy: Limited 30-Day Return Policy
$64.99





Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core Processor Model HH80562PH0568M - OEM Item #: N82E16819115018 Return Policy: Processors (CPUs) Return Policy
$194.99
Subtotal: $299.97

Or for an extra $15 you can get a stock intel cooler. I'd buy an aftermarket one tho.



Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core Processor Model BX80562Q6600 - Retail Item #: N82E16819115017 Return Policy: Processors (CPUs) Return Policy
$209.99