Brooke,
It does look like a j345, since it has the waterfall it must be the premium line. In the pretty expensive market here in the silicon valley I paid $6500 last year. That included the option package (cover, lift, steps, ozone).
I love my j345, smaller tub but nice open seating. If you're small and friendly you can squeeze 8 people in it. As TL and golf said good seats and good jets for a mid-priced spa.
I think you can get the warranty info off of the web, you should have him check the transferability. Having an intact (5/10) Jacuzzi warranty would be worth something.
Steve