If you after bass extension then sure, it’s definitely worth it. The DN-1000 does big bass much better than the B2.
See here for one of the reasons I don’t think the DN-1000 won't be an upgrade over a good TWFK set for all listeners: http://www.head-fi.org/t/478568/multi-iem-review-310-iems-compared-impressions-of-t-peos-narmoo-astrotec-olasonic-p-870-02-24-14/12960#post_10276305
In the end it really depends on your requirements. If you want deep, impactful bass the DN-1000 will blow the B2 away. If you want something that’s flat across the bass and midrange, the DN-1000 isn’t it.
I haven't spent much time with the Momentum but compared to the HD25 and SHE3580 the A63 and BA200 are quite different. The BA200 is warm but generally pretty balanced - it is more reminiscent of the Momentum than the other two. It may not be the most exciting sound for EDM but it's accurate and versatile.
The A63 is mid-forward and pretty punchy. I like but I'm not sure it can compete with the BA200 in overall SQ. It is a lot cheaper though.
The MA750 is bass-heavy and also warm, but less smooth than the BA200 and with a lot more bass power.
They are all good earphones IMO, just different, but the BA200 is my fave of the bunch. If you don't mind a pretty balanced sound and can find the BA200 in that price range, go for it.
Thank you for the reply joker. :-)
Wich of them is more similar to the she3580 and hd25 then? I lile the balance of both.
Any other suggestions? :-)