Stick with the single card for a bit and see how it goes and how happy you are. I would also like to say that "SLI problems" are few and far between these days and are pretty rare. Yes, there is the odd time a game is not well know and doesn't get SLI support or even more rare that a game performs worse in SLI vs single card, but you can always just turn off SLI to play that game. I really wouldn't suggest the hassle of trying to upgrade your 570 to a 670 or anything like that unless you've got spare money to burn or find a wicked price on a 670... I know many people are quick to suggest the 670 as it is a great upgrade, but the downside is the hassle of selling your 570 (if that is the plan).
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