Bike purchase tips for first time buyer?
I'm looking to purchase a bike for the first time and would love some advice about what bike to buy.
It will primarily be used for my 8 mile round-trip commute in Boston (i.e., mediocre roads) and some other similar distance rides. I'm interested in getting a single speed and would love a very light bike. I've preferred riding with bullhorn handlebars in the past, so that would be nice, as well.
My primary concern is speed. I don't really need racks or anything like that -- usually I'll just have a light backpack with me. My secondary concern is durability. I'm 5-9 and 155 lbs, so I'm not too worried about excessive weight on the bike, but I'd like it to last.
I'd like to keep it in the 3-digit price range, and ideally closer to $500-ish. I know I can go out and spend a ton but I don't think I'd appreciate what I'm getting quite yet.
I know very little about specific models and brands, so any specific recommendations would be very much appreciated!