I live in Los Angeles... close to Calabasas, where the rich people are.
Convertibles are NOT unique at all down here. I have seen about eight different "new" Mustangs. It's the new body style, but I don't know if it's 2010 or 2011. Only one was a 5.0. Out of the other seven V6's, six were convertibles.
For me, convertibles are ugly, unless you drop the top. Unless you plan on dropping the top very often, get a coupe.
Personally, I got a coupe with the Performance Package. Convertibles are for women and old men. (Joking, but that's who I see driving a convertible around here).