My precious road bike got stolen and now I'm thinking about getting a fixed-gear - after all, I rarely switched gears on my road bike. I live in San Francisco and have tried riding my friends' fixies and simply love them! But I have no idea on where to begin. I'm about 5'7 - what would be a good frame size for me? Is there a difference between a fixed-gear bike and single-speed? I've been looking on craigslist for a used bike...I'm hoping to find a decent fixie for less than $350. I'm looking for a fairly light-wright bike so I can make it up the hills in SF. Is this even possible? Finally, what are some brands I should look for in this price range? Are there any good websites where I can browse fixed-gear bikes? Sorry for all these questions. Any help would be great! THANKS!