High Country Performance in Englewood is excellent. hcp4x4.com

My old roommate also used Four to Go in Wheat Ridge - which sells the power steps and they have a good reputation.

I wouldn't trust 4 Wheel Parts for anything other than bending you over when you buy parts from them.

You really don't need a 4 wheel shop to do power steps - its a few bolts and tap a few wires. Find a good mechanic to do it near you.