You're wrong the 600 supports triple monitor gaming(nvidia surrounding) with one card, not all of the 600s though(only the 650 and above), now for decent performance of course it has to be at least a 660 ti or 670 gtx/680 gtx.
Thank you for the info ! Didnt know it was just for 650 and up !
Edit : Anw he said not hardcore gaming. So i dont think he needs that !