I too have thirty year old David Clark's, but with an aftermarket ANR module. They work extremely well, even in a noisy aeroplane like the super cub. I would just mention that not all brands of headset seem to work well with each other, so it might be advisable to consider that later you will probably need passenger headsets, and bear this in mind when choosing.
Do remember, buy cheap, buy twice could apply here.
Otherwise, go NORDO and use really good ear defenders :-)