I wouldnt recommend gtx 465s as they're weaker than the 460 1GB's and they cant be unlocked anymore (PNY didnt laser cut the disabled dies and they finally caught on).
So i put a list together for you that I feel would give you more performance than a single 5970.
Core i7-930
ASUS P6X58D-E
G-Skill Pi (really low timings and voltages)
2x MSI GTX 470s in SLI
3x 500GB WD caviar blacks in RAID 5 (you can get larger sizes for a few more bucks but I wouldnt recommend it because then you'd have multiple platters which would be slower)
Antec TPQ 1000W PSU
Silverstone FT02
LG DVD burner
Windows 7 Home Premium OEM
The total for all of that would be $2044 before shipping. I based a lot of those parts on personal experience (the hard drives and motherboard mainly). The other build with the 5970 was also pretty good except that you'd have to do some price cuts to include windows in that cost.
The processor comes with a basic heatsink but I'd recommend buying one thats a bit better. The Hyper N520 is a very good one for the price (dont buy from newegg though as its overpriced there. If you want to go for a really good one then get the corsair H50. If theres a microcenter near where you live then get the i7 from there as its cheaper (if they have the i7-920 in stock then get it and save $100)
Single GPU always better than two.Why get two 470's than when its time to upgrade you have to replace both 470's instead of just buying an extra 5970, when needed.Oh and my build has an OS included.