I'll put it all together for you right now:
Motherboard: MSI K8N Neo4 Platinum Socket 939 NVIDIA nForce4 Ultra ATX AMD Motherboard
Proccessor: AMD Athlon 64 3200+ Processor (Venice) Socket 939 Retail
Lets round up these prices so far..
RAM: CORSAIR XMS 1GB 184-Pin DDR SDRAM Unbuffered DDR 400 (PC 3200) System Memory
Video Card: MSI NX6600GT-TD128E Geforce 6600GT 128MB 128-bit GDDR3 PCI-Express x16 Video Card
Lets round up these prices..
Video Card: $178.00
Hard Drive: Western Digital Raptor WD740GD 73GB 10,000 RPM 8MB Cache Serial ATA150 Hard Drive (OEM)
The above hard drive is a faster and better performing hard drive, but if you don't want, heres a standard hard drive:
Hard Drive (Standard): Western Digital Caviar SE WD800JBRTL 80GB 7200 RPM 8MB Cache IDE Ultra ATA100 Hard Drive
If you want good sound, this is a good card:
Sound Card: CREATIVE Sound Blaster Audigy2 ZS GAMER Limited Edition 70SB035000013 8 (7.1) Channels 24-bit 192KHz PCI Interface Sound Card
These prices are:
Hard Drive (Raptor): $173.00
Hard Drive (Standard): $92.00
Sound Card: $114.00
Total Price with Raptor Hard Drive: $943.00
Total Price with Standard Hard Drive: $862.00
A standard case could cost you as much as $144, if you want to go out and get the Aspire-XNavigator like I did..
If your interested in that, it has the following:
5 80MM Fans
500W PSU w/ 2 Fans
Its a good case.. good luck on your system. - I reccomend the Raptor hard drive due to stabability and performance.
Hope this helps!