I just upgraded to a Hana Umami Blue cartridge since Hana was running a 20% off promotion and I was surprised how impressive the change was in bass and treble extension as well as immediacy, color and imaging. Even with the discount I'm sure $2K is outside of your budget and not the right match for a P3. But I did find it interesting when I recently read that Ortofon just released a new version of their MM cartridges that are made to fit on the Rega turntables. I haven't owned an Ortofon cartridge, but I thought that it was exciting that there is another choice for direct replacement cartridges for Rega turntables now that don't require shims: