Performance wise there isn't much of a difference, the major differences between these boards is what they can support as you have stated, some are ati crossfire compatible while others are sli compatible (2x and 3x). The Intel P45 boards that you have listed are also known for being able to overclock cpus much better than the nvidia chipsets. I think thats it. o and the nvidia chipsets have northbridge's that tend to run hotter than their intel counterparts and require active cooling
so would this one be the better of all of them?
if so, then ill probably order it here very shortly