future proof for the graphics card, but is the p45 really all that future proof? i mean the 780 i chipset, may have some bugs, but with the option for triple sli, especially when gtx280 prices drop which they already significantly have, the sli combo might be the most future proofed. i dunno, as of now im still leaning towards the p45 and ati card. i will build in december so it gives a little time for the 4870x2 price to drop (its slowly starting to go down).
The p45 is good for a single 4870x2, but it will be bottlenecked if you decide to go crossfire with another 4870x2 later on. Honestly though, by the time you'll need another 4870x2, there will be another card that will out-perform it.