Yeah c'mon i'm waiting in anticipation. Personally i'd go for the 2x 285, at the end of the day what game is gonna need more than that. Also if you can accomodate 3 x 4870 it leaves you with 1 spare PCiE. Go for it.
A single GTX295 will play anything well. You pay a bunch for decreasing returns in performance after that. Possibly more might be useful if you have a 2560x1600 monitor. Then , the sli gtx285 might be in order.
Today, the only really good SSD for the OS is the intel X25-M or E. The others suffer from big problems when writing.
If you can't afford that, I suggest a velociraptor, or possibly a 1tb wd caviar black for just the os, and plan on using only the fastest 10% of the drive..
Depending on how much you can find the cards for, the 285 GTX can be found for around 320$ after MIR if you look hard enough, and the 295 GTX is still around 600$, soo really both cards perform well at that resolution.
The 285 GTX overclocks higher, and has higher bus width and Vram, that might benefit ppl in the future. Also the 4870 X2 should do wat you want and it falls between the 285 GTX and 295 GTX for performance and price.
Buy one EVGA GTX 285, if you like it, you can buy another in a few months when (if) the price drops a bit. If you don't, you have 90 days to use EVGA's Step Up program to upgrade it to a GTX 295. Nice specs BTW, whichever card you decide on, that thing's going to haul ass. The P6T6 is a sweet piece of hardware.