Which upgrades for my Rega Planar 3?

The best mod's are one's you can only create yourself. I've bought everything for my P25 but still feel the platter my daughter and I built and the thick sorbothane we added everywhere did the most by far. Beyond that, the Pete Riggle VTAF is most important.

experiment with mats -- I have the Audioquest Sorbothane mat and the Ringmat. Both have different sounds.
re-wire tonearm with Cardas or other choices. Cardas worked for me.
Change the feet - many options, mod squad soft shoes worked for me.
You could try applying 3m dampning sheets to the underside of the plinth but I could not notice much change.

What about the tonearm rewiring services offered by BritAudio? One is Cardas wiring, the other a more elaborate Incognito package, that includes Cardas wires. Anybody familiar?

Thanks so far,
russ