I dunno... I've had pretty good luck with the RD-75's (but paid less than half they're going rate)...
I only run them as enhanced midrange (see below)http://www.audioroundtable.com/ArraySpeakers/messages/1281.html
AS such, there's virtually NO cross driver interference (limited only to horizontal plane), the planars are FAST, and the imaging is spectacular.
total cost per speaker was ~$700 US.