I want to get good headphones which deliver deep but accurate bass...

Meaning, I want an accurate representation of the sound on my Tyros 2. But I also like a deep bass.

What do you recommend? I once tried a Sony, (it was like a hundred dollars) and it was pretty much to my liking. Thing is I don't know the model.

However are there any in the $50 range that sound accurate?

Thank you.
Shim