I have also been considering the in-ear monitoring. Never was very carefull monitoring myself, but some months ago I discovered that a good and accurate monitoring inspires me a lot in my live performances. Go figure why... I can not help you with the precise input you're asking, Scott, but I happened to find this page on the Web last weekend. I haven't had an answer from them, though...
http://www.piens.com/action.lasso?-datab...id=1112&-search

-- José.