SLI is a must.
I ended up ordering the most expensive huge case Lian-Li has to offer, 2 gigs of Corsair XMS 800, the 620 or so watt Corsair PSU, another 7950, and an E6600.
Keep in mind this is coming from a 2500+, NF7-S, and a 9700 pro.
The jump should be considerable, eh? :P