I certainly wouldn't say they had too much bass, even the DT770's have more bass than that. But if you meant that they had too much bass relative to their treble, then yes, I'd definitely agree. The Logitechs are a really dark headphone, the treble roll off on them bothered me so much I had to return them in the end, even though I used up the 30-day return window cause I wanted to like them so much for their other qualities. Their soundstage was nice, they were pretty well detailed (more so than the M100's I think), the bass had a really nice slam/punch to it (especially when in active mode), and the mids were very natural. But that lack of treble in passive mode always made me feel like I was missing way too much information up in the higher frequencies, cause I had to really struggle and strain myself trying to even get a glimpse of what was going on up there sometimes. This problem went away in active mode however, but then the treble became shrill and artificial, and the nice mids just dissipated into the background. Not to mention that I didn't like the idea of having to go through batteries to get a sound I liked, so I had to return them in the end.
Overall, for portable use, I like the M100 the best out of all the ones I've tried (amperiors, akg tiestos, dt1350's, etc), but I wouldn't say they sound $100 better than the UE6000's, they just improve that severe treble roll off (though, the M100's are still dark themselves) and give a bigger soundstage, at the expense of more bloated bass with a slower punch, less upper mids, and less details. Yet, I still like them more; though the form-factor is also rather nice in comparison I thought, those M100's fold up to be surprisingly small, and that 'shareplay' feature with the spare input/output jack on the cups has already come in handy a few times.
For general non-portable use though, I would have to agree that it'll be really tough to beat the new alpha pad mad dogs. Those things are shockingly similar to the LCD-2's in sound, only with leaner bass/slam and a slight bit more treble, but otherwise they are just as smooth and have a phenomenally open-sounding soundstage for a closed can. They do improve quite a bit with amping, but if the OP sees going further into audio -- even if it's in the distant future -- then the mad dogs would probably be the best bet. However it might depend on what type of music you're gonna be listening to with these, as the others mentioned here do have more 'fun', thumpin' bass.
