I bought speakers from the Teufel brand to go with it.
Kind regards
Lino

I also have speakers from Piega and am completely satisfied with them.
But that's probably primarily a question of price, as you can connect any high-quality speaker you like

Piega ACE 30 or Piega Premium 301 fit very well

Piega or B+W.
I own Piega speakers myself. They sound marvellous and are excellently made.
Greetings Kurt

Well, it's a bit pointless to discuss what high-quality loudspeakers exist in this amplifier price range. Ultimately, it's a matter of taste, extremely room-dependent and much more. However, this may be interesting information: In contrast to the almost identical Denon model, the Marantz has the option of cutting off the low frequencies of the speakers at 40/60/80/100 Hz. This offers more flexibility if you want to buy a small subwoofer.

I connected my Piega, bought in Zurich > 10 years ago, and am very satisfied (with old music).

Mission 751 sound very good with this amplifier.

I can only recommend the "Teufel" brand, very good price-performance ratio and also the workmanship.