I'm about to jizz my pants... awesome project, subscribed. For cpu's you can find used i7 920's for just over $200, but if you get 980x's I'll really jizz my pants. btw if you don't want to sleeve all that, there are pre-sleeved extensions from nzxt. The only part you'd absolutely need to sleeve yourself is the sata cables, because the pre-sleeved extension is actually a molex to sata which looses the 3.3v. Also consider re-crimping your sata cable plugs, I just used a flat head screwdriver for mine:
and the single sata on the other end is for the optical drive, routed it along the front panel and back to the drive from above. *fingers crossed that you'll get fermi's*