upgrade or replace rega planar 3

The upgraded Rega has been compared to the Sota Star Saphire by someone who owns a Sota Star Saphire and it came out a draw. Since you have the rb600 arm, it is absolutely worth it to you. Not only that, but Rega is better for jazz than Sota.

I'm a jazz fanatic, and I have a P-3 24 with every Rega tweek known to man.

I would calculate the costs of the upgrades vs the cost of a new table minus the sale of your Planar 3. Inna's comments aside, Rega builds very nice turntables-so the Planar 3 may indeed be worthy of an upgrade, especially since you have already upgraded to the RB600 arm. Things I would upgrade in order would be:

1. New 24v motor and PSU
2. Groovetracer subplatter
3. Groovetracer plater

These upgrades will significantly raise the performance of the Planar 3 to almost P5 levels-the main issue, as I see it, is that you will still own a Planar 3. I had a similar decision to make regarding my P25-I decided to buy a used, but well taken care of, P7. I made the right decision.

Inna, my Rega P-3 fit your description, it was flat, until I replaced the tonearm wire, the motor, the sub platter, the acrylic platter, and installed the heavy weight arm balance; after that, it sang.

Orpheus10, that would be almost a new turntable, and it probably cost you another $1k or so. I would just see no reason to do that, nor would I trust a company that makes "junk" in stock form, be it turtable, car or whatever.
By the way, I keep looking for something to post in that video/music thread. Nothing so far.

Orpheus,
I dont know whos review or what model of Sota Sapphire or upgrade Rega you are referring to, but I have owned a Sota Sapphire III and Rega P3, both using RB300 arms and the Rega isnt in the same league, not by a long shot, whether you are comparing bass, quietness, speed regulation, isolation from external vibrations, PRAT or any other item. Its just a better made and performing turntable. Have you actually owned and compared both?