I've been reading about the Living Voice OBX-R2 that aerius mentioned on the first page. I'm trying to setup an audition for them now. Will update with impressions when I do. Hopefully the dealer listed in NYC still carries them.
edit: external crossovers seems so logical... you assume that they have to be sensitive to vibrations, and most speakers house them internally where there's tons of vibration (surprised more speaker makers don't do this)