The 2 Sundances look like good pricing, but they line up better with the Jacuzzi's 200 series, you might take a look at the J-280 or J-270 as well. All these have a 3 year warranty.
The J-335 is 5 year warranty with std circ pump and better filtration lights the works and a ABS base. Personally I like the J-345 more than any of those listed. Have you wet tested yet,lounge or no lounge? The 300 series also offers a bit more h,power pump wise, the J-345 also has two divertor hndls vs 1 in the other spa's you mentioned you like jet control, well there ya go!