Platter for Rega RP3 turntable

I have extensive experience with the Rega tables and have tried many different tweeks.

My favorite platters (in order) are:

1.  Funk Firm Achroplatter...the best, period.  I don't think they make them anymore, but still make the Achromat platter mat.  One of the best mats available.

2.  The GrooveTracer Delrin Platter

3.  The Shear Audio/Iron Audio acrylic platter

4.  The Rega OEM glass platter

I see that the Achromatic platter mat sells for a little over $100.  I'm thinking of buying it based on MoFi's recommendation. I can always return it if I don't like it or it makes little difference.
It's amazing what a little tweak can do.  I just yesterday got the Rega white belt, and the improvement was amazing.  All of a sudden the imaging snapped into place and the sound became fuller.  The bass even improved. I never would have believed it with just the change of a belt!
i originally mistakenly ordered the Edwards sub platter.
I haven't read any good reports about it, so I ordered the Tangospinner from Argentina which I've heard many good things about.  I haven't gotten either of them yet, but when they arrive I'll try and compare them and return the inferior one.  I know the Groovetracer sub is the most recommended but it's more than I want to spend.
viridian, Your certainly right about the dollars adding up, but for a few hundred dollars it's cheaper than buying a better table.

Another improvement I was thinking of was the  Rega TT PSU.
But at $400, it gets a little expensive.
Also, how much better can the sound get!?

P.S. I ordered the Achromatic platter mat.