Marantz pm6006 upgrade?

I'm looking for a new amplifier, reason why i bought this marantz was the built-in dac but now i am considering an external dac + amplifier.

I am considering Exposure amps (1010 or 2010). Can you suggest any amps (im okay with used ones) better than this one under 750 dollars. 

My speakers are Cabasse antigua mc170, preferred music genres: jazz, alternative rock, pop