Non Rega cartridge suggestions on a P6

FWIW, not specific to Rega just a general observation from having set up several turntables using a variety of cartridges and using AnalogMagik software, VTA is not super critical.  Put it this way, the difference in sound when VTA is correct versus when it is either high or low is very difficult to detect until the discrepancy is quite large.    

@billstevenson 

until the discrepancy is quite large

I calculate that the normal Horizontal Tracking Error from a 9" pivoting tonearm is about the same as Vertical Tracking Errors caused by changing the height of an adjustable tonearm by 8-mm vertically, which is considerably more than the 3-mm shim being discussed.

Is this the sort of discrepancy you have in mind?

I find that a VTA adjustment changes the sound and it’s very audible with a cartridge like the Hana ML or Umami Blue. Might take some time to dial it in. That’s why having a VTA adjustment capability is pretty important, at least to me.

I do not have a Hana cartridge in my collection.  I do have both Shibata and Fine Line, at present both AT and Ortofon both MC and MM are ready to hand.  I have a Denon DP-3000NE which is very easy to adjust VTA and offers a range of 10 mm.  Just for the sake of this correspondence I checked an AT VMN60xSL, which at a height at the back of ~4mm was correct according to AnalogMagik.  I then deliberately moved it all the way to the lowest setting and listened, then to the highest setting and listened.  In both cases I could detect a difference and AnalogMagik confirmed that VTA was off.  Subjectively, though, the difference was not great at all.  The caveat is that I am 78 years old.  A younger pair of ears should definitely hear more.