My opinion: Don't just buy for Moab, but buy for your driving as well. Think about how much off road driving vs. on road you will do. Look at the tire life, warranties, etc. A/T's will be quieter (for the most part) on the road which is where most of us spend most of our time and are the best all around tire. If your buying just for Moab, then go M/T's or more aggressive.
Buying cheaper now due to being a poor college person, doesn't always equate to cheaper in the long run. When I couldn't afford the tires I wanted I took out a "dad" loan and made sure I got 4-5 years out of the tires, including off roading.