Hey guys, I'm new here and have a question. I'm a student at a university who's living off-campus this year. I decided to commute via bike, so I dusted off my decade old huffy mountain bike and let me tell you, it's taking its toll. So I'd love to get a good, inexpensive commuter bike. Ideally a fixie or single-speed, as the school I go to is notoriously flat. I'm also planning on doing some fitness riding on the weekends, and maybe, MAYBE some touring in the future. I'd really love it if it wasn't more than $300. Also, I am 5'10-5'11 at 154 pounds, if that's relevant information. I'm also planning on building off the frame in the future. Any suggestions? Thanks guys!