I think you'll find any headset from a reputable manufacturer is very good these days.
One thing you must bear in mind is their compatibility with your instructor/co-pilots/passengers.
ANR is good. The level of extra expense has kept me from buying them so far. I prefer to buy the most comforatble pair so I don't get a sore bone peak on long flights!
David Clarkes are as good as any. The best I ever had though were Flightcom ones that I stupidly threw in with the sale of an a/c once and have regretted it ever since. They were SO comfortable and looked great.'
www.flightcom.net