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Generally SLI performance gain increaces as the power of the cards decreaces. For example two 8400GS in SLI will scale much better than two GTX285 in SLI. And my scale I mean get a much larger % performance gain. Therefore the best cards are the midrange cards where you can get a large performance gain (70% or so) instead of spending $600 on video cards alone and getting a 30% increace. Natrually two GTX280 will perform better than two 9600gt just because of raw power... however 9600gt is very popular in budget sli setups
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