you're getting some good advice on here. Being a first time buyer, (and seemingly a first time commuter) focus on some psychology, considering two important things that contrast. (1. Buy what appeals to you. If you don't like your bike, you won't ride it, no matter how much you spend. 2) Buy what you like as cheap as you can. If you decide commuting isn't right for you, you haven't wasted a lot of money. If you decide this is the life! as you ride the bike you like, you will start to learn what is important to YOU, and be able to consider that when you purchase your second bike that will be your best friend.