I wouldn't even use the Marantz in the system, I doubt it is any better than the Yamaha.
I use Denon, but when listening to some speakers a few years ago I listened to the Marantz higher-end line and was very impressed. In A/B listening to $3,000 B&K the Marantz really held its own. That was driving very low ohm and difficult loads. In particular, i was listening to 4-6 ohm PSB's and Martin Logan Clarity (I think). The ML are power hungry and the Marantz did a great job. On the low ohm PSBs it just sang. I have Marantz on my short list of replacement for my 3300, although another Denon will probably win the race. Two cents...
Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire