Sidewinder all the way. I've seen it in action, and I think it's probably the best LP reg I've ever seen, incredible consistency, flow and recharge rates. What you running it on? Anything from 1-500 psi and it should be fantastic.
I have probably heard the same amount of positive reviews about the Galdiator and the Sidewinder but more a few negative marks about the Sidewinder. It was being used on an Impulse and for some reason wasn't being as consistant as the owner wanted. The good thing about the Sidewinder is that not only is it a good reg, but you can get it in 3 different sizes.