The new Rega Planar 3

Viridian, agreed on the metal subplatter, I found the Isokinetik ISOSub GT 2 S sub platter to be a very good investment.

BTW - The actual brand of acrylic platter that worked for me was the SRM/TECH Acrylic Platter

This is one of the 1" or thicker  varieties available - with a thick rubber anti-vibration band around the outer edge.

When I was looking for a platter I came across several that were either 10mm or 12mm thick. Looked just  like the glass platter

Since I considered the mass of the glass platter to be crucial to performance, I believed that replacing the glass platter with an acrylic version of the same thickness would offer no benefit since it would be lighter.

Which type of platter did you try?

I have a RP6. Made several mods using Groovetracer. Dropped counterweight and subplatter. Subplatter made an immediate and amazing difference. Hugely improved bass and general musicality. If the subplatter on the Planar 3 is still some type of plastic, I would get the Groovetracer mod as soon as possible.

+1 on the GrooveTracer items.

So 
Subplatter
Rewire
Counterweight
Spacers(or Michell VTA adjuster?)

Looks like Rega P3 is just skeleton with no body!