I use hd 25's to produce, but my ears get tired really quickly using them and the frequency response is not great if i remember there's a big dip in the top end somewhere. I'm gonna get a pair of yamaha hs7's soon but I'm gonna be living in a flat next year so i'm really after a better and more comfortable pair of cans for production.
For djing, hd25, obviously. Music production I would strongly suggest getting yourself to a shop, take some tunes and listen to them. For me personally, I have focal spirit pro, which I think are fooking amazing.