Rega P5 Upgrade:TTPSU,Platter Or Subplatter?


I have read about Groovetracer acrylic platters and subplatter Reference being an upgrade to the stock ones in the P5. I've also read about better counterweights, one of them being Michell Tecnoweight to improve on the stock stainless steel counterweight on the P5.

Just out of curiousity, which upgrade below will yield the highest degree of sonic impact in chronological order?

1) Rega TT PSU
2) Groovetracer subplatter Reference
3) Groovetracer acrylic platter
4) Michell Tecnoweight counterweight
5) Clamp

Anybody tried an aftermarket acrylic platter on the P5?

Any opinions would be appreciated.
ryder
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Forgive my ignorance.
What is TT PSU?
Is it compatible with my Rega P3 turntable?
Would it make a difference in the sound?
TT PSU is a turntable power supply unit which makes sure the platter turns at a constant 33 1/3 rpm. While I don't have a Rega TT from what I have read and there is plenty of information out there this upgrade is a good one. I see no reason why it wouldn't be compatible with a P3.
I have all of them except the TT PSU, and I don't regret it.  You left one out, that's the tone arm wire.