You cant really bead the official MS one to be fair, I have tried a bunch and its been consistently the best one.
I do have a Razer Onza Tournament Edition, the general feel of it is good though not as good as the MS one as its a little light for my liking. The D-pad is *far* better on it though, so use it for GoW3 as I get sick of pulling out a smoke grenade instead of my gnasher.