I assume that what jwilliams is referring to as a "touchless" machine is what is known as a "Rim Clamp" machine. Most all tire stores have them now. Because of this, alloy wheel damage is not NEAR the problem that it was a few years ago.
Even with a rim clamp machine, wheel care is completely in the hands of the ape handling the wheel. If the person is throwing the wheel and all his tools around carelessly you will get damage regardless of the machine used. I don't have a rim clamp or even what is called a center post machine. I have an ancient manual machine with an air powered bead breaker. I have rigged plastic padding on all surfaces that touch the wheel and I can deal with the nicest of wheels without damaging them because I CARE.
I don't care if the shop you go to has a $10,000 tire machine, I would want to watch the operator do a few wheels before I let him touch my own. Make sure that he is not one of the apes that throws things around with no care for the condition of what he is dealing with.
Good luck,