But sli isn't his only concern. Theextreme4 isn't a upgrade from the board he has now. The of formula and the sabertooth are designed different. So if you don't plan to fully water cool your rig. I might would get the sabertooth. However... the OC formula is one of the best rated boards on newegg
As for a slightly cheaper board, what about ASUS P8Z77-V PRO compared to the Sabertooth? As far as I know, they are both very good for overclocking, both support SLI, and the PRO has onboard WiFi.