I did not catch that auction of Dylan/Robertson's guitars. Agreed on the Gretch guitar idols, but I think BB used mostly black Gibson models. Brian Setzer is no slacker, either.
My collection consists of a Epiphone Telecaster, Epiphone DOT, a Light Crust Douhboy Strat copy, Ovation Standard with an added pickup and a Bedell acoustic/electric I got at a huge discount when Bedell went "green". I don't play guitar well enough to gig as I do on keyboards.
One thing to worry about with guitars that are well made that are acoustic or semi hollow body guitars is what the humidity here does to them. Gretsch might have such a problem.