The Senn veil and detail don't go together very well. The HD 558 and 598 are fine cans, but are not exactly the detail monsters. The AKG Q 701 and Beyer DT 880 are better at that.
What's your budget? The Senns are subject to a MAP in the U.S. and elsewhere, so you'll have to keep your eyes glued to the "The Deals II" thread in this section of the forum.
My budget is under $200 if I can sell the Beyers, but preferably closer to $150, and right now only about $120. I've also heard the Q 701's are effectively more expensive K 701's. Have you heard both? Also is the Grado Prestige line good for detail? I've read complaints about sibilance and discomfort but the 125i's are a piece of cake to find in my price range and I can always change out the earpads.
Thanks for replying