Fregosi because he was their first real star with some longetivity (fringe HoF).
Trout b/c duh. He's been around long enough and accomplished enough.
Autry b/c he started this thing. Maybe not if the team is 25+ years older and more of us hadn't been witness to the teams of the '60s, 70's, and 80's, but for now he gets on the rock.
4th face is more difficult.
Ryan, Finley, Salmon, Anderson, Guerrero, et al.
Gotta go with Ryan. Too much head and shoulders above just about everybody else from the '70s Halos.