Apparently there are a handful of enthusiasts that don't mind a few missing low notes, open holes, and manual double register keys.
The Barbier alto Andy mentioned is up to $177.50 going into the weekend. Name recognition, association with Selmer;- and it's in good condition. Someone will get a nice vintage alto, but this time it's not going to be me.
Being a neophyte to the bass, and still a bit undecided on my soprano preferences, I am still hesitant about which alto I would prefer. I have pretty large hands so open holes is not likely to be a problem. I do love the feel of the plateau keyed 3-star and my mystery bass. Brass players, particularly trumpet players sometimes develop a preference for playing with parade gloves. I like them for trumpet because my fingers don't hang up or get sticky on the buttons and I can move faster with the gloves and the silver plating is protected from my salty skin chemistry. Woodwind players are probably less inclined to parade gloves.