When you do visit a flight school, find out if they will let you test out one of their headsets during a flight lesson. It certainly doesn't hurt to ask and it's the best way to determine if the headset is what you're after.
Just make sure you look at their selection beforehand, figure out which one of their headsets will work best for you, then ask if you can try it out during a flight. It's obviously not worth asking if their selection stinks.