Bobbie:
You can buy cars like this in good condition in the range of 7 to 20K. The La Salle is probably worth considerably more than the 1925 sedan, the La Salle is a much flashier car and has outstanding road performance for a pre-war car. But it always depends on finding a buyer interested in them.
Barrett Jackson is more of a reality show than any real indication of the market value for old cars. I would be reluctant to bring either car there, they will look plain jane compared to all the 60's muscle and pre-war Coddingtonmobiles. The big spenders know what they want and it seems that few original pre-war cars are popular these days, unless they are Duesies or V-16's and the like. You may end up buying the cars yourself, B-J has high commission fees and virtually all sales are without reserve.
I would test the market first on eBay or Hemmings, that's a way to reach lots of collectors without the high costs and logistic problems of getting to B-J.
Good luck, post some pictures if you can
Bill
Albuquerque, NM
