Cartridge Advice Please

Well, the fact is that Nagaoka MP150 is one of the lowest model in Nagaoka line, it has Elliptical stylus on Aluminum cantilever, nothing special compared to Shibata stylus on rare Beryllium cantilevers of AT20Sla or giant killer Victor X1II. 

I forgot to mention Garrott P77 (and new P77i) cartridges if you considering brand new cartridges only. I bought my Garrott from the Nagaona MP 500 user in Australia and he prefers the Garrott over the top Nagaoka MP-500 (which is very expensive and much better than Mp-150). 

I recommend the Denon DL103R mc cartridge. Conical tip - not fussy about VTA! An updated version of the venerable DL103 (designed in 1962 for Japanese radio broadcast use). I have been using Denon MC's (103, 103R, 103 Gold Anniversary, 301 and 304) for 40 years! They always deliver great musical satisfaction (for quite reasonable cost)!

The tonearm of the Marantz is not that heavy.

So I would recommend the Hana SL as a very good match for
this Clearaudio-OEM turntable.

Soundsmith in the USA has an excellent cartridge repair service.
You can repair a cartridge like yours for about $300 and it may be  better than new the they get through. Here is the link 
http://www.sound-smith.com/

At the same time SoundSmith aka Peter Ledermann, who serviced many thousands of cartridges, hates conical tips and explains why MI are superiour to the MC in his lecture, just watch it: https://youtu.be/F65mODzn4Gk