The Alclair Reference Master name has been changed to the Reference, and the RSM is an improvement in every way. Of course, the UE PRM is a big step up from the RSM, if that is the reference you are talking about, but the IERM is another story. My RSM has gone back to Alclair as Marc improved the tweeter, so I will get the newer version in the near future. You can see how things stack up purely from a technical perspective here.
If you look at my manufacturers list, one US company I think you may want to consider is Dream Earz, but the sound signature may be too bass oriented for your taste.