I bought a pair of 4DLX's that are great and used them for a couple of years and decided to do an ANR conversion on them and that works great. What a difference!
Now, the company that I bought the do-it-yourself or not kit from is called Headsets Inc. at headsetsinc.com and after the original price of the headset and the cost of the conversion at around 139.00 I think, it was somewhat cheaper than a new ANR set BUT, that was fine since I originally bought passive and long after the fact converted, in hindsight I wish I had of just got ANR new and be done with it. Flightcom the company(what a small world) which is across the street from where I work makes a fine Denali ANR but I think and all my pilot friends like the Lightspeed series better. The 15XL is lighter and cheaper.
So check the Lightspeed series is my advice, you'll be glad you did