Rebbi,
For greatest potential improvement, I'd look towards the separates if viable for you. I doubt you could go wrong with Bel Canto for compactness or even Musical Fidelity or Classe (those would be leading contenders were it me). A nice inexpensive used tube pre-amp ( with SS amp is also something to consider. An ARC might be too expensive, but a VTL or JUicy, BAT, or several others I've researched and/or had recommended could be interesting.
For greatest potential improvement, I'd look towards the separates if viable for you. I doubt you could go wrong with Bel Canto for compactness or even Musical Fidelity or Classe (those would be leading contenders were it me). A nice inexpensive used tube pre-amp ( with SS amp is also something to consider. An ARC might be too expensive, but a VTL or JUicy, BAT, or several others I've researched and/or had recommended could be interesting.