Get the E8400 wolfdale and don't bother with vista. Just get XP pro and foregoe the outragous price tag... put the money you'll save elsewhere.
don't bother with the 3870 cards... just buy one (or two) of these.
Get something bigger than the dell LCD. You can get a 22" BenQ LCD for around $220~$250 from newegg.
I'd also snag a 75 gig raptor hdd for your OS and the $100 500 gig western digital SATA drive for data storage rather than the seagates. Segates aren't bad drives but I just prefer WD's simply becuase I've never had one fail out of dozens of machines built using them.
Lastly, get this for your cpu.
There are tons of different choices for aftermarket heatsinks but these are considered to be at the top of the picks and it's performance speaks for itself in my system (see sig). The contact point was literally like a mirror also.