I am new to cycling and I need some advice. I am relocating to Phoenix, AZ and I will live a little less than a mile from work. I am very interested in commuting to work. I am also in desperate need of a new hobby and I have read/heard that Phoenix has some nice MTB trails. Considering that my commute will be very short, can I get a bike that performs well in both areas without making the commute too uncomfortable?? I don't want to spend more than $500. Any advice will be appreciated. Thanks in advance.