I fancy balancing my portly frame on two wheels again after a 22-year hiatus. It's for a bit of exercise and to get me places without having to use gas, but that's quicker than walking. My wife picked a figure out of thin air of 30,000 yen I can spend, let's say up to $350 equivalent. Does anyone have a recommendation (other than spending more)? I'm obviously not looking for anything professional or for racing, but don't want something that weighs a ton or which is going to seize up after a couple of years. I had a bike way back that was hard work on the slightest hill. I'd like to enjoy the ascents as well as the descents. Oh, I don't want drop handlebars. Thanks for any pointers.