Where do you intend to fly? If you're heading to remote and rugged areas you'll be wanting a headset that'll last and be dependable.
I have used Telex ANRs in the past and didn't like them at all. Perhaps their build quality has improved.
I have been using a Sennheiser (different model) for about 6 years with no complaint. In fact, I have just replaced them with Bose A20s.
The Bose X is good, but the A20 is much better.