you are looking at timings. 2-2-2-5 is exceptionlly good. I have OCZ gold in the same rig as my fatal1ty board. Also, the board can have problems reading and excepting shitty memory such as Ultra memory. I have been through that. It said I had 70000 bad addresses. But when I put the OCZ memory, it came out fine in memtest.
It doesnt really matter what you get pertaining to the GPU thing. I mean sli is worth it, but its gotta be worth it do you. I am fine with having a single graphics card, but having sli would be sweet. But its not really necessary for me. It is for some, but not for me. I would get the sli one if you cant find the single one. Plus, you could always add another card of the same type later on.