I think the need for SLI, is a poor excuse for a stretch in both ATI and Nvidia's profit margins..... Just like how Intel want dual processing BTX to be the standard tommorrow, single card solutions are always the way to go... And never justify going the SLI/Crossfire on the grounds of that the price will drop, that only occurs when new video cards get released, and then that means that weak 200 you saved for your second 6800GT will be no good because the IT mags and news are harping on about DX 10 and the whooping brand spanking new 8800GTX, leaving your cards with the same performance standard as two 4200's struggling to keep up 1024*768 in DOOM 3....
Keep your eye on the single card solutions, would you buy a car that had only a mediocre engine and then say well i can put a second mediocre engine in it (somehow, i ain't no mechanic (hypothetical)) Your car will still perform mediocre, just stick to single card solutions...... two 6600Gts in SLI is crap, save the cash....
There are only Two things in life i regret doing... 1. Selling my Soul for Cash.... 2. Buying a Compaq.... I should have kept the Cash, huh.