Those are good prices on both Jetsetters. I have not personally sat in the Jetsetter LX but I have sat in the Jetsetter and I thought it had very good power for a 110v hot tub. Given the LX is 220v with a larger pump it should have at least as much power if not a bit more.
I have very little hands on experience with Jacuzzi and none with Bullfrog. I know a few Hot Spring dealers who used to carry Jacuzzi and Bullfrog and all have told me they believe both to be quality products but as dealers both lagged significantly in terms of dealer support compared to Hot Springs. While I know how a manufacturer supports the dealer may not be important to the consumer, it is to the dealer because it affects how well they can take care of their customers.
At this point, I have not heard of any pending price increases though that could change. My personal opinion is I would try to make a decision sooner than later. If your dealer ordered your hot tub today it would be unlikely for you to see if before Christmas and with sales still in high demand these long lead times are going to be with us for a long while.
In my opinion, Jacuzzi parts are more expensive and as hard if not harder to get than Hot Spring. In my previous life before selling Hot Spring I had a harder time getting Jacuzzi/Sundance parts than I did Hot Spring and what I could get was really expensive. I personally never agree with any argument that says Hot Spring or Jacuzzi parts are proprietary compared to say a Bullfrog or Marquis. Just because a brand uses Balboa or Gecko controls, Waterway or CMP jets, Aquaflo or Waterway pumps, etc, doesn't mean they are non-proprietary.