Thanks so much for all of the advice! My mom had me talk to a coworker of hers who's into cycling and whose husband is a bike mechanic. We're about the same size and she's been helping me search Craigslist and suggesting bikes. I went to CityBikes last week and they said they'd call me when they had a Jamis Coda or KHS Urban Xpress built in my size. It will happen eventually, I know. I just hope it's sooner rather than later because my sad Huffy's rear brakes snapped off last night and my car's in the shop!