Hey everyone, I'm looking to spend $500-600 on a bike. I'm looking for something that I can ride to work which is about 10 miles away daily and 10 back. I want it to be sturdy, not too heavy, and also be able to handle the biking trails we have in Florida without a problem. I want to be able to jump curbs, and ride comfortably and with stability. And as far as the gears go, how does maintenance work with them? and how about the frequency of which i shoudl get a tune up? I don't know if I'm looking at a mountain bike or a commuter style bike. Any help on this would be much appreciated. Thanks!