Questions about Dali Oberon 3

I think something like that would do the Job: Denon PMA-600 (Verstärker)

Receiver is always difficult and it depends on many other factors (room size etc, what kind of sound you prefer, rather warm, natural, bass-based, which music styles you prefer, jazz, metal, pop etc...). I use a Yamaha Aventage RX 880 with Klipsch subwoofer. Music, movies, radio. I would probably recommend subwoofers with the speakers.

Anything that can output 25-150W @ 6 Ohm.