I am also leaning toward the Marantz M-CR603 for my own music stereo setup (http://www.whathifi.com/forum/computer-based-music/which-wireless-option#comment-2620952) and was wondering about what speakers to pair with this receiver.
There are some used floorstanders in my area: B&W CDM-7NT and Linn Ninka.
From your experience, would any of these be a good pairing with the Marantz receiver?
Both sets of speakers support bi-wiring, so I imagine that to get the most out of the Marantz receiver, I should probably do bi-wiring.
In the case of the Linn Ninka speakers, they can also be used actively. While this feature is supposed to be very beneficial for sound quality, I don't know that I can use this feature with the Marantz unit. Thus I'll probably just go with bi-wiring and keep in mind that I can buy some amps and go active in the future...
PS/ Is the impedance going to be an issue?
The Marantz receiver has an impedance of 6-8 ohms
The B&W CDM-7NT have an impedance of 8Ω (min 4.6Ω), so that should be alright.
But the Linn Ninka have an impedance of 4 ohms (passive) and 6 ohms treble, 8ohms bass (active)...