I personally strongly disliked the IE8 for classical as their midrange is rather thin, lacks body and is slightly grainy. Also, their bass is awfully bloated which will render cellos in the most undefined way possible. IMHO they can be good with other genres, but not classical.
The UM3x is much better to my ears, but they have a very narrow soundstage and lack dynamics.
If budget is no limit, I'd pick without any hesitation the Earsonics SM3, since they do everything at least very well without any major flaw. Also, they have one thing that's not frequently found with IEMs : great timber accuracy, and a very good sense of decay / reverb, two aspects that I personally find critical for classical music. They have superb dynamics, a flat frequency response if not slightly on the warm side depending on tips, and a realistic soundstage. Their midrange is by a long shot the best I've ever heard as far as IEMs go (better than the SE530 to me). I can't think of aything better for classical.
I haven't heard the FX700 or EQ-7 (supposedly good with classical as well, though I'd guess the Earsonics would still have the edge here).
Edited by MayaTlab - 7/14/10 at 1:16pm
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