For a four mile ride? Anyways, 12-15 miles is gonna feel like a REALLY long commute after work when you first start riding. Just remember, it gets better. If you up your budget to $300 instead of $200 you would open alot of options for your bike. Especially on craigs list. Here there is a post a day for a motobecane with the downtube shifters and nice components for $200. Just troll these forums and craigs list and you will find something you like. Even for half-centuries I like to ride single-speed, maybe consider it - It really opens alot of opportunities for bikes like the Kilo TT or a Windsor Timeline which fits 42c tires, fenders, and a back rack all on a road bike.