I had the BD DT770's and they weren't my style. They were the 70 ohm version so they required a small amp to properly power them. I didn't have an amp, so I wasn't getting everything they could give me. I think they have a 32 ohm version now which should be much easier to drive. Anyway, the ear cups are soft, velvety material which feels nice, but if you are sweating while playing drums it can get kind of gross. I also didn't feel that they isolated that well. They didn't clamp your head very tightly, so sound leaks in when moving around. Great studio monitors if you have an amp and are sitting still (and not sweating), but not that great for drumming.
I have AT M50's as well, but these are just fatiguing. My ears just hurt after about half an hour of listening. I really don't recommend them because of this. Okay isolation, and easy to drive, fake leather ear cups don't absorb sweat, so it has a few things going for it, but if your head just hurts while listening to them, its hard to recommend them.
My most recent purchase of headphones were the Brainwavz HM5's. Very neutral headphone, non fatiguing, easily driven, tight clamp force on your head, and big, soft fake leather ear cups. They have pretty darn good isolation (not 100% sound isolating) but I can't hear people talking at regular volumes when I wear these. They aren't too expensive either. If I were to recommend a not too expensive headphone with some decent sound isolation and good/great sound quality, I would recommend these.