Hmm, well, I'm 5'9", have a 29.5" inseam and weigh about 270, so I would be worried about the bike holding up in the long run. Also, a flat bar would be a must on a hybrid for me. I personally can't stand the way bikes with the adjustable stems and suspension seat posts look... Blea.
Would I be right in thinking that 15" bike would be too small?
Here's another bike I was looking at, however, I haven't been able to find info on the web as to whether I can mount wider (35mm) tires on it...
http://phoenix.craigslist.org/nph/bik/3239527761.html