my personal fav. is the sennheiser HD280 pro. They're right at $100.
I've had a pair of these cans for 3 years and they're solid performers. I'd recommend them, especially in noisy situations where their closed design is particularly helpful.
I use these with my portable headphone amp. They are small, inexpensive and don't need too much power..
I have some fancy headphones for recording purposes, but I prefer these for casual practicing because of the added low end.