Denon makes very good headphones. Anyone in the market for a new (or used) set of cans, regardless of price range, will probably find this both helpful and interesting reading:
http://www.head-fi.org/a/buying-guid...by-price-range
When it comes to receivers, I also like Yamaha, Onkyo and even Pioneer, with which I have good luck since 1971. I still have and use my vintage SX-990.
Newegg and Amazon are my go to vendors. Additional on line vendors worth checking out include J & R, Adorama and TigerDirect.