Martes has the answer here, could only tell you what SLI is.
Think that bridge needs to be bought seperate; didn't come with my card and aparently didn't come with your board. What I meant by models is brands, can get a XFX or Club3D, but too expensive. Instead of spending 150 on another 8800GT, you could get 2 9800GTX (called GTS250 nowadays) for about 200.
But check your prices first, they're so expensive here because of low supply. Maybe there's a retailer in the US that still has a batch of 8800s they want to get rid of for low prices.
At any rate, imo see how it runs first, take it from there. 8800GT should be enough for most bells&whistles.
