I've only personally heard the DT770s. If you are looking for smooth top end, those would do it. Pretty decent soundstage and separation too. I've seen them referred to as "basehead" phones, but that was not my experience. They do have a very nice, detailed low end, but not as pronounced as the Pro 700s you are using now.
I used an E11 Amp with them and I thought they sounded pretty happy. They have a pretty low impedance and are designed to be used with portable music players. You CAN run them off an iPod, but of course, they sound much more dynamic with an Amp.
Edited by bareyb - 2/10/13 at 1:51am