The guys at the Deep Powder House, in the Alta Lodge (one of the 5 overnight lodges, not a base lodge) at Alta. Supposedly very good, but I've no personal experience with them. The only ones in SLC to have attended Masterfit University.
Superior Ski Boots and Skis - inside Cristy Sports on the Snowbird tram plaza. Very excellent, and his prices reflect that.
The Lift House - 7200 South just west of the mouth of Big Cottonwood Canyon. Where I've had all my work done.