DO NOT BUY BOSE!!! They ABSOLUTELY suck.
I don't know what your budget is like. I've gone through the Etymotics ER-4P, Westone 3, Shure E530 and Ultimate Ears UE11 Pro Customs.
I own the last two I mentioned and I would highly recommend the Shure E530. Probably the best universal fit IEM out there. If you can go custom, that really is the best and a no brainer. If I want to use IEMs, I almost always reach for the UE11s.