Dear Bill: I'm only a music fan.
I think that the best you can do is to go for.
Acoustic Signature Final Tool, Moerch DP-6 with a Sumiko Celebration cartridge ( if you already have the 501 it will be fine with the Moerch tonearm ). This analog front end is very hard to beat and certainly not for any of your three choices.
Regards and enjoy the music.
Raul.
I think that the best you can do is to go for.
Acoustic Signature Final Tool, Moerch DP-6 with a Sumiko Celebration cartridge ( if you already have the 501 it will be fine with the Moerch tonearm ). This analog front end is very hard to beat and certainly not for any of your three choices.
Regards and enjoy the music.
Raul.