gblum1,
I have a '06 J-345. It's the 320(325)'s big brother. I've had it since October of '06 and have had nothing but positive experiences. The 300 series are very good tubs especially for the money.
The 325 uses the same control packs and filtration/circulation method as the J-345. My water is always clear and my panel has fought the elements of winter great so far. It's also a 240v tub standard. When refilling you get about 6-7 degrees an hour with the heater (That's good). My cost of operation for my 345 is less the $23 a month in the peak of winter. They are very well insulated tubs to say the least.
I paid $6095 + tax for my 345 last year. My dealer prices their 300 series in $500-$600 increments. So a new 325 should go for around $5K. You probably have a little wiggle room at $3600 for that '03.
I hope this helps.
Don't hesitate asking q's, I'd be happy to answer any you have.