the 9800gtx will outperform the 8800gts by a litle and 2 98700gtx will probably smoke one 9800gx2 think of ti as the 7950gx2 two 7900gtx cards where alot faster then one 7950gx2.
The good thing this time around though is that Vista actually supports the use of 4 cards/gpus because it will actually allow 4 frame buffering whereas Xp only allows 3 frame buffering.
Darn you veed, now i want to step up..... >.< what was your total after stepping up one GTS? Also 205 in queue is really good, when my friend stepped up his 8800gts 320mb to a 8800gts 512mb there were 600 in queue before him. Took him two weeks to get his card back.