Hi gdm,
I don't know if Cal Spa has improved their warranty, or what their warranty was for that matter. I would jump on their website and see what their warranty details are for the particular hot tub you are considering, if you do that, there will be no surprises. Most folks here will tell you that having a good dealer is one of the most important things in a hot tub purchase, so if your local guy has a good reputation and has been in business for a long time, that is definitely a plus.
That said, Jacuzzi is mentioned as one of the top brands here (along with Hot Springs, Sundance, Bullfrog, Marquis, Artic, etc.). Cal Spa has been described as second tier. But, 3K is a big price difference. If the Cal Spa fits your purpose / needs, the warranty is good and the dealer is top notch, you could tuck that 3K into an account and use it down the road for post warranty issues. Quality vs. value is often a tough decision. Enjoy your hot tub search!!