Why do people knock SLI so badly? I don't get it. With some cards, you can get the same performance via two cheapos as one expensive. The market is slowly shifting out of that ratio though with cheaper flagship cards and 1/2 priced cards at 1/4 performance. But look at it this way... Its like an extra 40 bucks for an sli mobo. And the good chipsets support sli. So if you want quality...you have to sli option no matter what. And its always nice to have, just incase crysis roles around and you're little GTS is struggling or something.
Get the 650i mobo. No one needs 3xPCI-E. But 2 is handy...