There are quite a few vintage MM cartridges I would recommend someone to check out on eBay or HiFiDo or Japan Yahoo....
- Empire 4000D/III Gold
- Signet TK-7SU
- Signet MR5.0Lc
- Signet TK-7LCa
- Shure V15/Type III
- Acutex LPM420-STR
- Garrott Brothers P77/SAS
- Victor X-1IIE MM Cartridge
- Victor Z1/SAS
All of these will give sound quality as fine as (or better IMO) than many of the uber-priced LOMC cartridges available today.
There are quite some more vintage MM and MI that are worth a look but all need appropriate loading in order to be operated with a linear frequency response
- Acutex M312 III STR -> 150 pF total capacity, 24k Ohm loading resistor
- Grace F-8L 10´->145 pF total capacity, 21k Ohm loading resistor
- SONY XL-45A -> 140 pF total capacity, 21,49k Ohm loading resistor
- Audio Technica AT-155LC -> 100pF total capacity, 24,54k Ohm loading resistor