In light aircraft when you are training you need something a bit different to when you are operating a jet airliner. Dave Clark make good solid dependable headsets which will last a lifetime, and are very well suited to light piston aeroplanes, and turbo props. As you move on in your career you will find that different headsets suit bigger aeroplanes, and by the time you get to that stage the technology will have improved. Also different types have different systems (some have power supplies for noise cancelling systems, others don't so you will need a headset with a battery pack), some airlines will loan you a noise cancelling headset, some will sell one to you, and some will expect you to supply your own. In short get something suitable to get you through the training stage, and see where you go next. As you will have found out a high quality ANR headset has a very hefty price tag whereas a bog standard DC will be considerably cheaper which I would imagine is a consideration as you begin training.