Having a look at a certain ebay place brings up loads of them for sale at about the 100 quid mark. These DC's really are an investment for life.
So if you get one for 100 quid it will be about another 60quid to replace the pad,cup and mic foam. Which will for all intents and purposes gives you a brand new headset.
If your going beyond PPL it really isn't worth getting one set then upgrading later.