Well sure. The two 780ti cards will give you loads of performance. If you're not bothered with constantly updating your drivers and sometimes waiting for a while for new games to have multigpu support and don't mind your electricity bill going through the roof, go for it.Everyone complaining about sli is making me sort of nervous. Is it really that much extra hassle? I dont want to get rid of my 780 ti just to bump up to an 880 that will probably only be a small performance increase. Adding another 780 ti would be much more performance when the game gets sli support(hopefully at launch)
Mind you, The Witcher 2 only got SLI support like 3 months after the release. Not saying it'll happen again but still..


