I use a pair of Prima Luna mono power amps and can attest - good sound, versatile (tube-rolling), easy to use (auto-bias), nice build quality. Another option at similar $ is a used Pathos Classic One hybrid. This unit has a ss ouput stage which might be either a + or a - depending on your preference. A great looking and sounding piece, though.
Good Luck,
Marty
Good Luck,
Marty