You have to decide wether you're really going to be using 3(!) Videocards in the future (let's just say you most likely won't) The P6T got 2 PCI-E slots with 16 lanes and one PCI-E slot with 4 Lanes. The EVGA Board has got 3 PCI-E slots with 16 lanes...
That's basically the only thing thats better about the EVGA board...dunno, buy it if you want
I would probably do it myself because of the extraordinary support EVGA gives you.