snom now has extension microphones available for their very well-built MeetingPoint conference phone. According to snom's website this will allow you to extend the MeetingPoint's reach up to 70M!! (whoa! thats bigger than our conference room!) Also remember that the snom MeetingPoint works as a SIP and OCS endpoint at the same time.
See snom webpage:
You may have interest in the First Impression Video Review we did last August of the MeetingPoint conference phone below. I'll try to do a 1 Year Later Review--we love the unit.
Kerry Garrison also did a review of the MeetingPoint available here: