Clarify on "I would do CFX or SLI every 3 months" part? Once you SLI or CFX, you stick with it unless you share the card with another person every 3 months?
G1 Sniper is better than Saberbooth, Maximus V Formula is the best of the 3 hence the most expensive. Go with the G1 Sniper 3 if you want to build it now since Maximus V formula isn't out yet.
well i am not sure to go for GTX 680 or 7970 but lets say i go for 7970 i will get another one in 3 months time.. (to save some money)
So if i would go for sabertooth then i will just get 2 7970.
But if i use sniper i would go for 3cfx maybe more after a year