Rega P25...upgrade or replace


I've owned this rig for a while now, having upgraded from the P3. While it sounds very nice, it lacks the refined sound and resolution of...say a well recorded HDCD disc on my CD player. Table is stock, used with a Grado Ref. Platinum 1.5mV and Grado PH-1 (tried a ARC phono stage that was lifeless). I'm considering a step up to the Sonata cartridge, and tweaking the table/arm with one or more of the following: machined sub-platter, new counterweight, Cardas re-wire of arm, acrylic platter, Boston Audio platter mat.

Plan "B" would be picking up a nice pre-owned VPI Scout/JMW 9 setup...not sure on cartridge, but most likely the Sonata.

Any suggestions/advice from some of the analog gurus here?

System: BAT VK-300x w/ tube front end, Cardas Golden Cross cabling, CAL CL-15 CDP w/ JPS Digital AC power cord & VansEvers digital power conditioner, Tyler Acoustics Linbrook floorstanding monitors wired w/ Cardas.
hedgehog
As a long time owner of a P25 I can echo MoFi's advice. I have done the Incognito(cardas)rewire. I gained some clarity and solved a grounding issue. Then the E-Z Riser VTA adjuster, I would look at the newer ones now, but that gave me that adjustment. I added the Michel Techno-weight and boom there was bass and the bass was good. I then added at MoFi's advice the Deep Groove sub-platter/bearing assy. and yes the bass was more defined. Than I added the acrylic platter and that seemed to bring the whole thing together. I started out with a Grado Reference, then a Benz- Glider and now have a Lyra Lidian B. I may be stepping up to a Argo or possibly the New Rega MC cart. or the possibility lingers for a new table. But my point is the P25 can really add years to it's life with these tweeks and upgrades.
Thanks, for all of the valuable input guys.

Viridian, I have used the table/cartridge with phono stages from Plinius, Musical Fidelity, VTL, ARC and Classe'. Outside of the Grado, the VTL was the only one better. I have heard great things about the EARs, and I may try one someday.

Theo and MoFi...thanks. Maybe I will tweak around with the ol' P25 a bit. One nice thing is that it can be done a little at time, not requiring large lumps of cash at a time. Theo, who did your re-wire work for you? If you had to pick two upgrades/tweaks, which two would you perform first?

Thanks,
Chris
Decided to go with a couple of small upgrades for the time being. Ordered the Boston Audio Mat 1, and the Kerry K2 Titanium H/W.
I graduated from a P3 to a P25 like you and after a year of that I heard a VPI Aries 2/10.5 in my system and the world started to move. I've been very happy with the Aries 2 for almost five years now. It is truly a state of the art table for the price point. If ever I trade up it will be another VPI.