West Marine's price is $100 higher than at least two other retailers. I'd buy it from this one because the former owner (very recently former) is an active member of this board as HopCar:
Hopkins Carter Marine Raritan Marine Elegance
Buy the toilet yourself and let the yard install it. There's no reason why it should ever have to come out for repair...I've never heard of a single one that has. I'm starting question just how knowledgeable your yard is when it comes to sanitation systems.
Winterizing the Elegance is no more involved than any other toilet. If you opt for fresh water only, only the holding tank will need winterizing...winterizing the fresh water system winterizes the toilet.
Peggie
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein