Could you clarify "recognizing that I might need a phono stage with these"
What cartridge are you currently using? Does your Rotel have a built in phono stage? If not, what phono stage are you using with your Thorens/Grace set up? Do you mean a step up device? You may need one for the Denons but not for the Grado or Sumiko.
What cartridge are you currently using? Does your Rotel have a built in phono stage? If not, what phono stage are you using with your Thorens/Grace set up? Do you mean a step up device? You may need one for the Denons but not for the Grado or Sumiko.