I bought the shure se215 from amazon and they are a very decent iem imo! the warm sound does seem to go a little as they burn in, but just a little! The warm sound is actually very good for extended periods of listening, as it is a non-fatiguing sound. ie ideal for travelling on a bus all day etc. The isolation is really really good as well, and the unique way it is put on is really secure and minimises cable microphonics to virtually inaudible levels.
It comes with a case too!
oh and the build quality is second to none at this price level. The cable is kevlar reinforced, which incidentally can be replaced, feels very strong and i have yet to get mine tangled up in a knot, but im a bit anal at putting it safely away too.
If you want some proper advice head over to headfi.org it has a crazily big community, just for headphones, grado even made some esp. for headfi the hf1 and 2. Theyll be people there who know the sennheiser sound you like and advise accordingly!
Regards
ed