480's are loud, run very hot and were replaced by the 570's with ease. Sure SLI 480's will beat a single 580 but that single 580 can max out any game out there atm. You can quite happily SLI the 580 a little down the line if you want
It may help if you take a look at what resolution you play at, etc. You mentioned you want to play using 3dvision. If you're at 1920x1080 a pair of 560 ti's should be plenty powerful and you won't have the big power consumption you would with a pair of 480s (keep in mind the 480s would be faster).
There are some pretty incredible deals on 560 ti's right now and you could probably find a pair for around $360 or less after MIR. Cheers.
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