Liking this one mate
Only thing I would mention is are these your photo's - if not it'd be worth getting permission from the owner/creator or giving credit in the banner.
I know if it was my photo/car being used I'd be honored if someone asked me to use my work in such a prominent area of their site and most likely happily give permission without even giving credit - on the flip-side I think I'd be a bit miffed if someone used it without at least crediting in the image (a bit like we do with out current banner).
I know we are just chucking ideas about at the moment but I just thought it'd be worth a mention.