The Rotel, I have one as a backup and recently replaced a Meridian transport with it while the Meridian was being fixed and my warm system - CJ pre, Classe amp, and Mit cables got considerably brighter. MIT or Cardas and a new CD source will difinetly help.
Theil/Classe 6, and listener fatigue
I have Theil 2.2 speakers, a Rotel 855 CD player, a B&K 442 amp, and recently replaced a B&K pro 5 with a classe 6 (a later model than the DR). There is much more detail to be sure but it comes at the expense of fatigue. The highs are either too bright or edgy. Any advice would be greatly appreciated.