I can mainly speak from what I own and love: VPI Avenger turntable, Zesto Audio Andros 1.2 phono stage, and the
cartridge options are many: Ortofon, Transfiguration, Miayaja, Koetsu, etc.. all are excellent in their own right but vary based on your personal taste. The VPI Avenger can be manufactured in belt drive with an analog speed controller by VPI (extra $1000) and gets a lot closer to the magnetic and direct drive, which gets at your diminishing returns question. The avenger table also allows multiple arms if you own a lot of mono and stereo records. I would go with the VPI Avenger (future proof), VPI ADS speed controller, Zesto phono stage (tube phono stage with multiple inpits and gain/loading flexibility), and one on the high end carts I mentioned above. The dealer I work with sells all of it, and definitely think it will be under $25k and well in your budget. Let me know if want to talk with him. Best of luck
cartridge options are many: Ortofon, Transfiguration, Miayaja, Koetsu, etc.. all are excellent in their own right but vary based on your personal taste. The VPI Avenger can be manufactured in belt drive with an analog speed controller by VPI (extra $1000) and gets a lot closer to the magnetic and direct drive, which gets at your diminishing returns question. The avenger table also allows multiple arms if you own a lot of mono and stereo records. I would go with the VPI Avenger (future proof), VPI ADS speed controller, Zesto phono stage (tube phono stage with multiple inpits and gain/loading flexibility), and one on the high end carts I mentioned above. The dealer I work with sells all of it, and definitely think it will be under $25k and well in your budget. Let me know if want to talk with him. Best of luck