Rega Planar 3 upgrades

Hi Everyone,

I have a couple of quick turntable related questions for the community.

A little background.  I currently have two turntable setups.  One is a Clearaudio Concept with a Dynavector 10x5 cartridge.  The other is Rega Planar 3 (2016 version) with an Ortofon 2M Bronze.

I've been thinking of upgrades for the Planar 3 and took the plunge on a new Neo TTPSU.  Any thoughts on a Groovetracer sub platter?  How close would I be to a Planar 6 at that point?

The Clearaudio MM cartridge that came with the Concept table was barely used when I upgraded the cartridge to the 10x5.  I still have it laying around.  Can anyone recommend to me a good relatively cheap (under $400) turntable that would be a good fit for this cartridge?  I believe it weights 8 grams and has a tracking force of 1.9 to 2.5g.

One final question.  Can anyone recommend a decently easy to use cartridge protractor?  I need to learn to do my own setups.

Thank you