Since cartridges are musically dependent, I never recommend one. The TT can be upgraded substantially by tweaks. Incognito tone arm rewire, heavy weight for the arm, and "Groovetracer delux subplater". Those three tweaks made a substantial improvement in my P3-24.
Upgrade from Rega P3-24 .....
Please take a look at my current updated system's analog front end. I am perhaps considering an upgrade, thinking about the Rega RP6 and the VPI Traveler, with a nicely matching high output MC or MM cartridge. My total budget is around $2000. Would either of these tables be a considerable enough upgrade over my current system to justify a new purchase ? Or would I need to spend more $$$ to really hear an improved sound ? Other thoughts ? I love the way my system sounds now, but may be experiencing a bout of "upgrade fever." I've already taken some aspirin, but the fever won't go away.