Is it worth it? How much will you pay to get your hearing back in 20 years time. Seriously, I get headaches flying without an ANC headset, they reduce fatigue, make radio recerption clearer, the list goes on. I wish I had bought mine earlier.
Talk to Adams at Biggin. They do DC conversion sets and they fit them for you too. (About 100-200 quid)
The other option is to buy a shiny new one and keep the avcom for passengers. Planes are noisy things, get the best you can afford.
Remeber, if your ears ring you have permanently damaged them.