It has been a while since I owned the D7000s, but I found them to be more musical than the LCD-2s which I currently own. Musical meaning you tend to find yourself tapping your feet, rocking your head, and just enjoying the music. The LCD-2s in comparison and from my aging memory still allows you to enjoy the music and you will have some fantastic bass in those orthos, some of the best available, and the sound is extremely dark and intimate. The best example I have is the LCD-2s is like your favorite artist performing a live show for you in a small club vs a huge arena or hall. The sound is small, but detailed, and warm. It can be a very pleasurable sound.
However, in terms of over exaggerating some of the signatures of the sound, the D7000 is the culprit. It will present the music to you in such a way that it is far more emphasized than what the artist intended and that in turn can be seen as fun and musical.
The LCD-2s will provide more accurate bass in comparison, from what I recall, and bring the sound closer to you rather than further away as would the D7000s. I would say the LCD-2, to some, myself included, would be considered less "fun" but that is because they are a little more accurate in how the sound is meant to sound. I'm sure some would argue with me or perhaps be able to explain it better.
I have not heard the HD650 but do plan on purchasing those in the future. The TH-900s keep that fantastic bass of the LCD-2s, get rid of the bass bloat found in the D7000s, and add clarity to the D7000's signature. They clean up the "exaggeration" quite a bit and sound far more refined while still keeping a great deal of the signature that people love in the D7000 - that part that is musical and fun. Some people would argue that by doing that, the TH-900 becomes less fun, but I say the TH-900 becomes more talented and in control of its sound signature vs. the D7000s.
I'd say the D7000 is a young athlete who's got a great deal of talent, loads of potential, but lacks the experience to fully put it to use. The TH-900 is that athlete several years later; still extremely talented, much more experienced, and far more capable of using his skills for their intended purpose.