Yea, just getting 1 gtx 680 should give you the same or slightly lower performance. If you're willing to spend the money, get two gtx 670's in sli since your mobo can handle them. Otherwise, you could just get 1 gtx 670 for now and run the 480 as a physx card til you can save up for another gtx 670 (same could be said for the 680, get one now, buy another later).
Currently using an antec 900, good for air flow but im also getting Cooler Master Storm Stryker as an upgrade.Using liquid cooled cpu with a tripple rad , hard to find cases for it, and i would get a water block for a 680 but im not to sure my pump would support a loop that big
3930k oc to 4.7
corsair dominator platinum 16gb 2133mhz xmp
intel ssd 120gb x2 raid 0
xspc water cooling kit tripple rad.
Corsair 1050 psu
so i guess it looks like gtx 680 with a 480 sli might do the trick untill i sell my 480s and buy another i guess...
Well you could consider the windforce card if you keep the Antec case but after the upgrade the cooling would be much worse and you'd be better off with just getting a regular card, that's the only reason I asked.