Hey Marcus. If you are insistent on going with
Shure, I would go with the PSM 600's or 700's. I have had good experiences with both. However, I would recommend the
Sennheiser 300 G2 units overall. They are my favorites. There are plenty of dealers for both
Shure and
Sennheiser products, so I would not worry about limiting your purchases to one distributor, unless you are getting such an amazing deal, you cannot pass it up. In fact, I find that most people who do not regularly shop for gear competitively, find that they over pay for things.
For
IEM's your spec of "a 700 seat
auditorium" does not give us much to go by. With wireless gear it is all about the distance / relationship between transmitters and receivers. There is a drastic difference in performance if the transmitters are on the side of the
stage, or in a booth at the back of the
house. Since you are using multiple units, I strongly suggest you use a antenna
distro / combiner with some decent antennas. If you can give us more info on who will be using them, and for what type of events, we can give you more info.
Personally, I think the actual earphones make the biggest difference in
IEM's performance. There are so many models from cheap
headphones to custom ear-molded units, that even the greatest
IEM wireless setup can sound like garbage on cheap
headphones a garage band guitarist may insist on using. There is no one
unit that is the best. It really depends on the artist preference and the type of event.
~Dave