Just got the D600.
I don't know much about the Bose you're comparing to. What I can do is compare the Denon with my Pioneer HDJ-2000. And the D600 is brand new --not burned in yet...
I also like bass. Don't want to call myself a basshead, but come'on, you gotta have clear, punchy, AND deeeep bass....right? (I also have Q701 for music that doesn't require all that bass.)
The Pioneer is the so-called flagship in its DJ category, which means that it has elevated bass. And the HDJ-2000, being the best of their DJ cans, has better mids and highs than the 1500 and the 500. Also, Tyll at InnerFidelity gave his thumbs up for the 2000. He DID say that these are pretty good cans. He also did mentioned that the bass on Pioneer's are slightly muddy...but I really like them, and I thought that the bass is strong, clear and punchy. Yeah, I couldn't tell.
Until I got the Denon.
Denon's bass is one step up. And this thing isn't even burned in yet. Everyone's sound signature preferences may be different. But for me, D600's signature is spot on.