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can't comment on pricing on the other 2, but if your getting a Grandee w/ all accessories for $9,500 that is very very excellent price
the grandee is tub only the other two include steps, and music (which is not a major issue)
wet tested the Euphoria was nice, great wirlpool feature. Our local sundance sales people didn't have an optima available for wet testing but did test the cameo seats are a little different configuration but had the therapy seat that we liked. Some of the seats in the Euphoria seemed deaper than the cameo? Have dry tested an optima. Even thought the tubs are similar sizes seemed like more leg room in Euphoria? Also, the sales pitch about Marquis eliminating circ. pumos because they fail alot is something to consider? Optima is about $1000 less also.