Thanks for all the responses.
I checked the UC360 specs and the maximum room size is 35'x35', so that just might do it.
The Polycom 7000 spec suggests a maximum 40'x40' but the ability to add an extra mic is really interesting. Also, the managers who would be using it are already familiar with the Polycom Soundstation Premier, so the learning curve won't be as painful as with the UC360:)
I guess I'll call around and see if I can get some demo units.