I used david clark 13.4's for a long time in the dash. Be advised at PDT, PDT guys will want to use those lightweight headsets and yell in the cockpit instead of using the airplane's built in interphone to talk civilly, forcing you to pull an ear cup off and say "WHAT?" a lot. (Think Little Jon!) Up in former ALG country you'll be able to sit in quiet peace and use the interphone. I could never understand why someone wouldn't want to use equipment installed by the manufacturer that enhances communication and margin of safety, but I suppose it's not how the guys flying big jets do it, hence the aversion to it. If I were you I'd look into better seals for the 13.4 and make it comfortable for yourself, and if you really want ANR, get the kit. If you plan on being based down south, I wouldn't waste any money on ANR, as it won't help you with an ear pulled off all the time.