go with the DFI LANPARTY nF4 SLI-DR, everything else looks pretty good. 6800 is awesome, a buddy of mine has it and being a ATi enthusiast, that is the only nVidia card that I like. So I hope that you like it. The only thing that I would change for sure is the hdd I dislike Seagate with a passion everyone I know that has one it ends up crapping out on them, so I use Western Digital, and I have never had a problem with it. And all of my friends that I reccommend a Western Digital to they thought that it ran faster than the Seagate they owned.
Check this out:
Western Digital Caviar SE 3.5" Serial ATA150 Hard Drive 250GB
It may cost $10 more, but just look at all the extra space you get!