I like the C80 mod, will use that for another application. Think will go with the Variac, talked with David Riddle, and that will work out great. He is relatively close to me as well, will probably be able to will call.
As far as the types of transformers...... the display will consist of 6 G-Scale using MRC xformers, 3 O-Scale using various Lionel older xfrormers, (LW, KW, 1031), and 3 HO/HO-3 tracks. (not sure of those.)
THANKS so much for ALL yours guys help! Hopefully someday I will know enough to pass it on. Really appreciate this forum!