Yes depends on many things, room size, positioning (close to walls?), music and volume and budget. With Marantz 6004 i would get a sensitive pair something from around 87dbs+ and probably avoid 4Ohms rated ones as well. B&W 685 should be OK, so should AE 301s, Kef R100s. I would avoid Kef LS50s and B&W CM1s.
But you need to go and hear a wide range and find what you like, speakers make a large difference to the sound.