So... I haven't ridden a bike since I was 15 and I'm now 27. I'm looking to start commuting to work on a bike. It's 20 miles round trip. Mostly flat asphalt, with a few sidewalks. I plan on riding 5 days a week, rain or shine. I would also like the ability to take my bike over dirt paths, and roads. I have done a little research and I think a hybrid is what I am after. My price range is 250 to 350 dollars. I am 5'7" and weigh around 165lbs, I'm sure this matters too. I don't want a total piece of crap, and I'm cool with something used. Any advice would be much appreciated. Thanks.