I'd have to agree with diabloII on most of this stuff really. I'd go with a 1 GB stick of RAM and the 6800 GT. Also, did you think about trying RAID with two hard drives instead of buying just one? I don't know completely how it works yet, but that'll be my next experiment. Another thing is that you don't need a great expensive keyboard. I have one that costed about $5 and it works great. It is quiet when typing, and it is black and silver. It gets the job done. I just don't understand why anybody needs a $40+ or $50+ keyboard.
I don't think anyone has said anything about a monitor yet. Are you going to be doing a lot of gaming? That will affect what kind of monitor you'll want.
AMD Athlon 64 3000+ socket 939 @ 2.3 GHz
MSI K8N Neo2 Platinum motherboard
EVGA GeForce 6800 GT
2 GB DDR 400 (PC 3200) (2 x 1 GB sticks) (Dual Channel)
DVD player and seperate DVD RW drive
80 GB Western Digital Hard Drive
500 watt power supply
Sound Blaster Audigy
Logitech 5.1 surround sound speakers
SAMSUNG SyncMaster 710T LCD monitor
Aspire X Navigator Case