3db - that is exactly the same hot tub I have.
Nice Spa with room for plenty but It rarely sees more then a couple people at a time - I love it and its been a very good utility for my occasional back issues....
Sundance makes a very good product and stands up to their warranty issues I have had... Mine had a bad control board, which was changed out, and a faulty jet pump both covered. Only really had to address the head and neck cushions... which are not covered by warranty, but they are a wear item and will need replacing after a few years depending on your chemical usage, which depends on your local water.
Keep those using alot of lotion out of your tub - not good for the filter system and will accumulate around causing a ring of goo over time...
Beware of flybynight spa outfits.... I have seen alot of people get burned. Stick to name brand products - avoid costco or sams club units...
There is a Spa Forum which you can hit up for more info about the units you end up focusing on.
http://www.poolspaforum.com/beta/forum/index.php? Tons and tons of great info there for those looking to buy, as well as maintenence...
I was steered away from the spas with lounge as it takes up room and one can't really just sit in a lounge, but that of coarse is up to you...
ARCTIC has one of the best names in the business, albeit not the cheapest price range.... I was down to choosing between the Sundance and the Artics - my buddy sold me mine at cost - so it was an easy descision for me... When I did mine, with the help of my buddy for building the deck - I think my total cost with deck, and electrical was a bit over $10k as I did all the work myself, so no labor costs.
My location for my tub turned out pretty cool, I have a 4 season room off my kitchen and it had a door which led to nowhere with a 3-4 drop to the ground so I ended up building a deck off of it and was able to sink the tub down lower into the deck for easier ingress and egress - I'm so glad I did that - make it very nice not to climb stairs to get in and out. Finished up the deck snuggly all the way around the tub. I love winters in the Tub with the starry skies overhead - keep that in mind before building some obstruction over the top of it... I don't really care for hot tubs that are enclosed, try to utilize trees and natural blockage from the neighbors if you can... My yard is completely closed off with woods so no prying eyes - I'm very lucky in that respect...
The internet is your friend for chemicals and filters or what have you, much cheaper then the dealer.
Another point that should be made which I have never seen discussed is that if this is for physical therapy type scenario - keep in mind that Physical therapists don't like hot tubs all that much. Reason being is that most people use them to relax and then nothing after - what you should be doing is after using the spa - then take the time after to stretch and exorcise before that muscle tissue starts to shrink back and tighten up worse - which can be detrimental....
Good luck on your hunt...