Cartridge for Rega Planar 3?

I have a (more than a little upgraded) Rp3. Not much different than the planar. With a 3mm shim, I'm running an ortofon 2m black.  I haven't heard a better match for the 3 range Regas. MM or MC. 
The compliance issue is importatant with the rega arm as it's not high enough mass for the 103's imo.
As to recievers and  integrateds, so much depends on the quality of the phono section. Maybe the most cost effective way to get the most bang would be to go with a moderately price phono pre into line level input.  G Slee two, perhaps? 
With a 2m black you could squeak in around 1k.  Look on eBay for discounted 2m's

Btw. The Herbies mat on the stock platter is killer.  No need for acrylic which can have its own coloration. 
And do give it that rega nudge. Belt will last much  longer.  

I have just bought a new P3 with the premounted Elys cartridge. I haven't spun vinyl in over 30 years. My last turntable was a Mitsubishi connected to a Pioneer receiver and some Bose speakers. I will now be hooking this new turntable up to a Parasound 200 watt amp, a Conrad Johnson PV-5 preamp's phono output and some Elac speakers. My question is, based on the huge difference the CJ had on the sound of everything else, is wouldn't the phono section to this preamp (or any other preamp or receiver) have a larger impact than the cartridge? If that holds true, then how can one make comparisons or recommendations based on their systems when these other variables may actually have a larger impact than the cartridge itself? I see it as an endless game of very expensive guessing.

High output MC make no sense, so it must be LOMC or MM/MI
I have no personal experience with Rega turntable, but cartridge must be selected for the tonearm, calculation is pretty easy if you know your cartridge compliance @ 10 Hz and tonearm effective mass.

I would recommend Victor X-1II mid compliance MM with rare Beryllium cantilever and Nude Shibata stylus tip. One of those amazing vintage MMs that you can't go wrong with. Superb sound quality if you're able to find NOS or MINT- sample. Ask if you need help. 

Nagaoka MP110 or MP150. I have both and they are superb cartridges that are appropriately priced.