Well, the Palit GTX 460 Sonic Platinum seems to be getting the best benchmarks of the bunch. There is a huge outcry though, the review cards out in europe seem to have a couple of vrm heat-sinks that the north american retail cards don't have. Palit says it isn't necessary because under full stress the card doesn't reach 80 degrees. I don't know how true the words coming out of Palits mouth are, but it certainly is the fastest card of the bunch.
I have also heard nothing but great things about the MSI card as well. It isn't even close to the fastest card but it has a cooling solution that destroys all the competition so overclocking should be a breeze. Other than that, they all seem to be coming in at the same performance. Just remember to buy the 1gb version of the card, the 768mb version is a crippled pos.