A~bomb:
One of those Republic Bikes from urbanoutfitters would probably be perfect for you. If you're riding it 3 blocks on nice dry days with no hills, it'll be plenty of bike. Plus, it looks nice.
A lot of people on this forum will give you **** about being a trendster or something, and one of those urbanoutfitters bikes certainly won't give you internet cred, but it really is a good choice for someone like you.
Just a tip though:
If you get this bike, the hardcore hipster faux-messengers on campus will not respect you. They're a bit of a joke amongst people who pretend to know a lot about bikes, this forum included. I know you'll say you don't care, and that very well may be true, but I'm just putting it out there. If you care about that kind of stuff, just get a KiloTT and say you're doing it because it has better components and tubing. There's nothing wrong with that.
I've checked out the Republics already, and I like the amount of customization for the price. I'm not looking for respect, and I know some of the hardcore guys can be real d-bags when it comes to stuff like that. At this point, I think I have it narrowed down to either the Republic or a Kilo TT. I'll have to get a front break for the Kilo, but that's not a big deal. There are a lot of drivers and pedestrians who don't know how to deal with cyclists on my campus, so I think a front brake is good to have just in case.