Is Marantz AV8805 good enough pre amp for McIntosh MC8207

For your stereo listening you can get a high end very good stereo integrated amp. Doesn't have to be stereo separates. Really good stereo integrated amp such as the Gryphon Diablo analog integrated amp (expensive) but you will need a very good front end source components to go with that. There are other countless options out there. 
Do you have a turntable? If you only had a digital front end source components you should consider getting either a PS Audio DirectStream DAC with a very good streamer and transport, various Naim DS, either Linn Akurate or Klimax DS, etc.
Again there are countless other options out there. 

@tomiiv30 - How do you like the AV8805?  As I have said in multiple other threads, I tested the 8805 and thought it was very good, but with slightly rolled off highs.  If you want more high frequency resolution, I recommend upgrading the fuse to 2A SMALL Hi-Fi Tuning Supreme.  This will likely increase the video quality as well, because the video was a little grainy in my opinion.  The Marantz is excellent design, but they use very slow op amps in the DAC I/V section to create the Marantz "warmth".

@caphill Do you think it is worth getting that expensive amp to drive my less expensive or entry level B&W 683’s S2? I mean I like this speakers for what they are but I would not think that they can handle the kind of amps like the Gryphon Diablo and such. What’s your take on it?

Sorry cause first I didn't know what your speakers were. My bad. Yes, what you currently have are more than good enough for your B&W 683 S2. I think the Mac is somewhat overkill for your speakers. The Rotel amp will do just fine for your 683 S2. 

@auxinput I still haven't gotten it yet, it will be few days until it comes to my house. Once I get it and install it I will let you know my thoughts and I think that I will like it because I am coming from a very old almost 20 year old receiver which is Onkyo that was paired with some shitty Polk speakers. Few months ago I upgraded the speakers and got the B&W's 600 S2 series speakers, I got a pair of 683 S2 Floorstanding, HTM61 S2 Center and 2 pairs of 685 S2 bookshelves to give me that 7.1 surround. I will be upgrading my sub and will get 2 of them and think that i will go with REL or JL. Also looking for suggestion for my Atmos speakers I want to get 4 of them for the Tops/Heights.