Reply to Studio headphone: Sennheiser HD25-II or KRK KNS8400? Which and why?

Hi,

Looking for a dedicated studio headphone for producing. Its either or. Ive already ordered the SD25s, but now a few people telling me to get the KNS 8400s instead.

Thoughts please?

http://www.sennheiser.co.uk/uk/home_...188?Open&row=1

http://www.krksys.com/krk-headphones/kns-8400.html

Thanks