If you like soundstage do not buy the senn's HD-25II, because they have none. They do have incredible SPL and ofcourse tight bass.
I bought the Beyerdynamic DT770 PRO instead, they have a huge soundstage and allot of bass but not as much SPL and are quite sibilant.
Why don't you get the senn's HD558, I have heard them and I liked them! They have good spl, so you can always cramp up the bass in the EQ.