For the love of god, don't go near the DT770. And don't pay any attention to these guys who haven't even heard them saying that they've read they're good in posts by other people who also haven't heard them but read somewhere that they're good. They do not, repeat, do not have what you're after. In fact they're pretty awful.
You want tight, accurate, tonally smooth non bloated bass? Go planar. Ortho or stat.
If you want to stick with dynamics? Ergo 2, Goldring DR series (Dr100 is very good value), or at the cheap end, the KSC-75 all spring to mind, the Goldrings are particularly nice with a good tight bass, although perhaps a little tizzy in the mid to highs. They get much better if you pry out the stock drivers and put in some SFIs, but thats another matter.
You haven't actually given us a budget, or what kind of headphones you're after (portable earbuds, full size expensive ones etc) more information in this regard would be useful.