Why don’t you like McIntosh?
If that was directed at me, I did not say that I don't like McIntosh. I'm not familiar with your amp, but it looks like a nice one and should have more than enough power to drive your main speakers. If you like the amp, then get a preamp with home theater bypass. As another poster described, it's super easy to switch between the preamp for 2 channel listening and back to the Marantz for home theater duties.