Alright, since my bitter disappointment with the Shure SE420, I'm now on the prowl for a good set of IEMs. But without being able to hear them before buying them before buying, and seeing as I'm in the market for something higher end, I'd rather not go blowing another two or three bills on...

Some background: Once upon a time I owned a pair of Shure E3c IEMs and loved them. They were great; excellent sound, great isolation, perfect fit -- so long as I used the foam tips. See, my ears are a bit odd in that the concha -- the indentation that leads to the ear canal -- is a little bit...