If you don't experience too many hills, I'd recommend looking into getting a single-speed/fixed gear. Single-speeds allow you to coast (along with the necessity for a front and rear brake) while fixed gear bikes do NOT allow you to coast (and therefore only a front brake is necessary, as you can use your legs to slow the rear wheel down by back pedaling).

I've been riding fixed for over half a year and I highly recommend it. Low cost, low maintenance.

Here's a good start (take a look at the Mercier Kilo TT and any of the Windsor models; all highly recommended [they vary in frame material and tire clearance. If you have crap roads, look for something that will accept tires upwards of 32mm+]. I have a Kilo TT): http://www.bikesdirect.com/products/trackbikes.htm

And here: http://www.bikeforums.net/forumdispl...amp-Fixed-Gear

The main appeal is low maintenance, as you only have 1 gear to deal with.