My wallet started to like you, as it would be cheaper to get the momentum (which would make an excellent portable headphone as well).
The wall also contains the D5000, which almost everybody agree that is weaker than d7000. He didn't put them on the wall because they were to expensive, and considered the d5000 to be a better value.
The problem is that the treble on D5000 is most probably even more problematic than of D7000... Actually, from many impressions I've read through, D7000 shouldn't have overemphasised bass like D5000 have (I have seen graphs on innerfidelity to support this and my other thoughts) and their treble should be a little less evident than of D5000. I am sure that D5000 is going to be a better value but I would be worried to buy D5000 before trying, for sure. People dangerously often mention that D5000 are more fun than D7000 which in reality implies even more U-shaped sound signature.
However, Momentum should be very similar to LCD-2 in their sound signature (very flat bass and mids along with not overemphasised treble) and that's what I like very much... For me, it would be a clear purchase if ever needed a closed-back pair. Or, you can wait until Audeze releases their closed headphone :-)