Sure! I'll be honest, lately I've been pretty in love with the UE600. I wouldn't call it a bassy signature, but it's definitely got more bass than any other single BA I've tried. At the same time, the highs are crisp but not harsh at all. Mids are fairly forward so vocals and guitar comes out beautifully for rock. Overall, there is a very pleasing warmth to it. And if you're in the US, they're only $50 on Amazon right now!
As for the AH-C400, I'll admit that you've got me pretty curious about that one. I haven't heard it yet, but I think I'd definitely like to.
I wish that I was in the US, but unfortunately I'm in the UK and these are priced at £90 which is about $135
Also the thing that's making not want to buy the ah-c400 is the remote as I don't need one.