So I'm about to start graduate studies in a new city and will no longer live within walking distance of campus. I used to ride quite a bit from grades 5-9, but fell out of it in highschool. I mostly did trails, stairs, and ramps, but have since lost interest. My current bike is a Miele UA with cable disk brakes added on. It has front and rear suspension. I have grown (both in height and weight) since I bought this bike, and no longer feel especially comfortable when riding. I have a few concerns. Mainly, I am worried about commuting on a bike with front and rear suspension - I feel as though a lot of my energy is being wasted with the inefficient suspension and fat tires. So, I was thinking about getting a new bike. It would be used mainly for city riding, maybe some gravel or hard dirt paths around campus, but almost exclusively pavement. I am wondering what kind of bike I should be looking for. I'm not sure what my budget is a this point; what are my options with selling my current bike or trading it? When it was purchased years ago it was around $500 plus whatever the brake upgrade cost. I'm thinking that I would want a bike with disk brakes again (i think that's what they're called anyways) because as a teenager I had my vbrakes replaced and tuned constantly. I'm not sure if I just had poor quality ones, but I hate those things. Not sure if there are other options, too. Any advice or suggestions are very welcome, thanks.