Rats, I am exactly your height and wieght. I bought a Diamondback wildwood men's comfort bike and it is great. I know some of the guys here might laugh at a bike like mine, but it works for me. It is a little heavy, but the do make an aluminum version of it. I have problems with my back, so I really appreciate the upright riding posture it allows me. I use it for commuting, sometimes 20 miles round trip and have no problems. They don't cost a whole lot, so you might take a look at one at your LBS