Welcome to the club! Jason at
bassstringsonline is showing
Invalid Link Removed. I've never tried them, so I can't give you a review, though. If you register your TB membership with BSO, you'll get an extra discount.
As far as the Jazz pickup goes, I put a [Invalid or Expired Link Removed] in my sunburst SS Jag because I wanted it to be hum-canceling. I might have gone with the discontinued Fender Super 55, but it was not available at a decent price at the time. The Jag's stock P pickup sounded great already, so I only changed out the J.
If you have a bit of neck dive, I found that since the pots are so small, the control cavity has plenty of room for some stick-on lead wheel balancing weights. My red SS Jag didn't dive, but the sunburst (which only weighed in at about 6 1/2 lbs) took about 8 full ounces of weights to balance well.