We also went with the 320 because of the moveable island & the configuration of theater seating & entertainment center. If you have no need/desire to move the island, a few 320 owners have made it permanent. We went from a 34ft 5er to the 320 & have had no issues with the length difference.
Wayne & Sheryl
Plus Ollie & Sophie
(they don't know they're dogs)
2011 Ram Laramie 2500 CC 4X4 6.7 Cummins
2015 Columbus 320RS
"Where ever you go, there you are" Buckaroo Banzai