Hi
I would recommend getting as many on site demonstrations as you can. CleverTouch are currently number one in the interactive flat panel market, but CTouch are rapidly catching up, followed by SMART. SMARTs 6065 is a good product, especially with the object recognition which makes the transition for teachers much easier, however the lack of remote control and therefore freeze/still function can impact a number of teachers.
I've done a lot of work recently comparing the options so don't forget the BenQ option which is also popular.
CTouch, CleverTouch and BenQ will all do onsite demos if you are keen so its worth trying everything and seeing what your teachers think
Lisa