I have a friend who has expressed interest in getting a bike. She wants something to ride around her neighborhood - no Cindy rides for her. She's short in stature, and overweight. What do you all think - cruiser, hybrid, or comfort bike? We want to keep it under $600. This may just be a passing phase, she's been trying to find something she likes doing to get back in shape, so she doesn't want to get anything too expensive. (I had to stop her from going to Target or WalMart for a bike......)