If you're doing roads/trails, the Trek 7100 is a good choice. Actually, any hybrid would be good, but the Trek's have excellent quality. My mom's got one, and it's rock solid. I have a Specialized bike, and the quality is nowhere near the level of the trek. I really like a hybrid bike for on-road / Bike path riding, it's the perfect balance between speed, traction, and weight.
Edit: For size, go to a bike shop and ask them. I'd suggest buying the bike there (because they should be able to service it). You might be able to get one online cheaper, but it's not worth the hassel. Go local