Rega P25-best upgrade

A P5 would have a better chance of giving it a run for its money but a P25? doubt it. Jeff Dorgay of Tone Audio did a comparison with his P25 and his P9, same cartridge on both tables and said that while the upgraded P25 was an overachiever, it didn't outperform his P9. He did say it wasn't a blowout win for the P9.
The newer 24V motor and optional power supply are noticable upgrades over the older P3,P25 models so the gap would probably be bridged considerably. Remember that the P9 has a much more sophisticated power supply and the RB1000 is a better tonearm than the RB700.
Disclaimer: I manufacture Rega turntable upgrades.

I will chime in on this... I have owned a P25 for approx 3 yrs.
The first upgrade I did was change the c/w to an Express Machining "Heavyweight". This improved bass in both weight and reducing a slight muddiness. Also, improved tracking ability on the carts I used it with.
Within the last 3-4 months I have installed the three Groovetracer offerings- Counterweight, Subplatter and Acryllic Platter.
All I can say is WOW! These "upgrades"improved EVERYTHING to my ears.
The Rega strengths of Timing, musicality, and pacing are all still there but now the bass is lower and tighter, the highs are extended even further and NO "hotness" or gratiness, just smooth extension. Soundstage depth is a good 3' to 4' perceived deeper.
The midrange is meatier than before the "upgrades" and more palpable, especially on female vocals- I am falling in love with Joni Mitchell....again.
I paid $600 for the P25, and about $500 for the Groovetracer products. I am currently using a Rega Exact cart, I paid $250 for and a Rega Fono I bought for $200. All told for less than $1600, I could not be happier, nor do I believe I could do better for the money.
The Groovetracer products are first rate in design and build and are truly a snap to install. Doing business with Groovetracer was a hassle-free, pleasure, and I would urge you to spring for the three "upgrades" as your budget allows.
If you can do all three at once, I would do it that way, but if not, in this order.... Counterweight, then Acryllic platter, then subplatter.
I would not trade my table for an LP12 or a Scout....they are both good tables, I just prefer the P25/Groovetracer.
I will probably buy another, more expensive table someday, but I will keep the P25/Groovetracer.
If your on the fence.....jump, you'll be glad you did.

I would like to chime in here for the record. My experience has been similar to others as far as replacing the subplatter but I have to let everyone know that I found the Iron Audio Acrylic Platter apalling. Sure it tamed the highs a little and took a little of the edge off of bright recordings but overall I lost dimensionality and detail. Not hurt your ears detail, the detail that makes a flute sound like it's solid and floating in space instead of the sound of a flute in 2 dimensions. The detail that makes a soundstage deep and 3 dimensional. The acrylic platter just lost all of that. I just got done calling musicdirect and getting a return authorization. The acrylic is going back...

The glass platter with the Funk Firm Achromat is the best I've yet heard. Used the paper/cork mat thing for a long while but the Achromat was a big upgrade.

I was wondering about the acrylic platter upgrade for a long time. Now I don't have to wonder anymore.

My other upgrades:

Pete Riggle VTAF
Silicon Nitride ball bearing
Mapleshade heavyfeet replaced the stock Rega feet
Project Speedbox SE

Each of these made a major improvement.