We are now on our 2nd Montana and really love their line. Currently have a 3100RL and just love the floorplan as it gives us a lot of room to move around and the bathroom is it's own separate room. Also, this floorplan has the stairs to the bedroom offset to the side and this blocks anyone in the main area of the 5'er from seeing into the bedroom. We feel this gives us more privacy and no one can see if we made the bed today or not.
You just have to check them all out and go with the one that just feels best for you.
Good Luck, Scott