Not sure why you need a new toilet, but I would opt for the toilet.
We have tried the Suite Life (more than once) and have decided booking an aft veranda and choosing to dine in specialty restaurants is preferred. Now, class of ship does factor into this and on M class both specialty and retreat amenities are limited. I guess if you want to try Luminae, now is a good opportunity. Luminae for breakfast is great , for dinner , not so much (for us). If we choose to travel in Retreat class again it will include many specialty restaurant nights as we don't care for Luminae