Solo,
What I am saying is if you get a Hot spring, Sundance, Bullfrog, Caldera or one of several other brands, it will be a good decision.
You will not find the perfect spa at the right price from the right dealer.
The Vista has the DX moto.
You have stated your mother will make up the difference between your $7,000 and what the right spa is for you.
Don't sweat the small stuff.
Exercise:
Rank in importance:
Price
Spa
Dealer