Dear Rich: Unfortunately and in your price range there is no stock today 100K phono stages.
The Musical Surroundings that you named is a fine design that could help you about.
Now, maybe if you ask to other phono stage manufacturer they could give you a unit with the 100Kohms impedance, it is very easy for them.
Rich unfortunately too there is not much know-how ( out there ) about MM cartridges, almost all manufacturers are on the MC " road ".
Sorry I can't help you about.
Regards and enjoy the music.
Raul.
The Musical Surroundings that you named is a fine design that could help you about.
Now, maybe if you ask to other phono stage manufacturer they could give you a unit with the 100Kohms impedance, it is very easy for them.
Rich unfortunately too there is not much know-how ( out there ) about MM cartridges, almost all manufacturers are on the MC " road ".
Sorry I can't help you about.
Regards and enjoy the music.
Raul.