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.