Hmm, I think they are 14".... tough to be sure. They could be 15s with really fat bubbly tires on them. But I had to bet I'd say 14.
Definitely go for some black ones Mike. :) Awesome wheels. Let's see, 15x7 comes in 35mm offset? Or 38mm? I wouldn't go higher than 40mm if possible. +45 wheels get sucked inside the fenders too much IMO.