What do you think the weaknesses of your system are? I can't help you too much on the speaker side since I am not familiar with the proac. As for analog:
The Denon it a fairly good cartridge (at least on a friend's turntable) and works pretty well with the P3. Also, I assume the phonostage in CJ should be pretty good. If you do want to upgrade on the TT side, I would upgrade to a Gyro, a Teres, or similar first. Then I would change the cartridge. E.g a Denon DL103R with a step up might work well if you like the Denon sound.
I can give you some thoughts on the P3 and Michell Tecno (sorry never heard the Gyro). I have owned over the past years:
Rega Planar 3 + RB300 + Elys, Creek OBH 8
Rega Planar 3 + RB300 + Denon DL103, Trichord Dino
Tecnodec + RB 600 + Kontrapunkt A/Denon DL103R, Trichord Dino
While the Rega P3 (older version) was a very musical player (in particular with the Denon), the Tecno was a clear step up from the Rega in almost every aspect: blacker backgrounds, more detailed with more extended and smoother highs and a very fast tight sound. On some recording the Tecno might be a little on the dry side, but that is probably more due my Trichord phono stage. Only in the bass I feel both the Rega and the Tecno could go a little deeper and sound a little fuller. The Gyro should be a step up in that direction.
I would love to listen to a Teres or a VPI table someday, but did not have a chance so far. Also a restored Garrard idler wheel table might be interesting.
Good luck!
Rene