Thanks to everyone on the forum for your advice and feedback. After a long and somewhat stressful process (I obsess over this stuff), we've pulled the trigger and purchased a J365.
Throughout the entire process we wet tested a Coast Silhouette, Artesian Grand Cayman, J280, J245, Maax Elite 5400, Sundance Chelsea, Sundance Optima and J365. Originally I was leaning towards a J280, but the moment I wet tested it I knew it wasn't right for us. So, thanks to everyone who encouraged doing a wet test.
Honestly, my favourite of all the tubs we tried was the Sundance Optima, but we just couldn't afford the price. I believe it was 10k plus taxes. I'm envious of any of you enjoying this tub. Perhaps we'll upgrade someday. :-)
In the end we chose the J365. Overall I think it's the best tub for our needs. The only thing I was disappointed in with the tub was the pressure of the dome jets, but it wasn't a deal breaker for me and I know we're going to be very, very happy with the tub.
We're having a new patio, pergola and fire pit installed this month beside our existing deck, and hope to have the hot tub set up by November 1. Can't wait to get wet.
Thanks again for all of the posts, info and input this site and users provided. It was all so helpful in our decision.