Yeah I'd be going SLI in the future that is why im looking at the nVidia chipset, although I've been getting mixed reviews. I've always had Asus boards and they always have treated me right never died on me. So I'd be more leanient to getting one
The problem with the Asus 750i board is that the PCI-E slots are very close together, so cooling your cards in SLI can become and issue. Aftermarket heatsink installation can be tricky as well, because of the proximity of the slots (if in SLI).
The eVGA 750i doesn't have that problem. It also looks to be a great OC'er (several threads on XS forums). I'd be tempted to buy one myself but last time I checked, I still wasn't an hardcore gamer...
I'd go for the eVGA 750i in full confidence (from what I've read) !