Well in the end I went for some Soundmagic PL21s after reading some great reviews for them, and they're the same price as the Senns.. so far I'm much less than impressed and have no idea what the "audiophile" reviews are on about! Pretty weak and hollow sounding, quite "cardboardy". I suppose you get what you pay for, but I'm gonna give them a good seeing to with some white and pink noise before I make a proper decision. I guess they're good enough for my intended uses, just would've been nice if they sounded a bit more natural.
They are really comfy though, it's nice to get a range of different sized plugs as usually they're too big for my ears.
edit - actually they seem to be really picky about the positioning - get it just right and they sound fairly full, but quite dull at the minute. Gonna have to use the dreaded non-customisable ipod eq settings! Or maybe I'll just return them..