Opportunity to buy Demo Magico M2?

Without a doubt, if you can, buy the M2's they're an exceptional speaker.  I have S5's and a very very revealing system riven by Devialet mono's with JL Fathoms subs.  The M2'as are not a large speaker but stunning to look at and exceptional build quality.  They're easy to accommodate.  Most importantly their sound is amongst the very best at any price and significantly better than my S5's which are in turn much better than A5's.  All that being said, you will want a pair of high quality sub woofers like JL Audio Fathoms.  With that you will have everything you want.  They are accommodating of a wide variety of rooms but with such a large room will need additional bass reinforcement. It's not just the bass notes that will improve but soundstage and presence too. I'd also be tempted to explore a used pair of M3 for around the same price, try talking to Josh at Scott Walker Audio.  Your Gryphon will do wonderfully with both M2 and M3.  As one previous poster commented, Synergistic Research cabling helps enormously with this setup.

It’s still a lot of money. I would only do it if it is assured you can try and get money back if not up to snuff.

@nyev 

Thank you for the kind words. I’m sure whatever speaker you pick you will be very happy with the end result. 
 

Ron 

Perhaps you could visit the Washington DC area and audition gear at Command Audio and Video.  They carry Rockport, Magico, Focal and Devore speakers, and their electronics include Gryphon.  

And if you do go there, you are also less than 15 minutes from Deja Vu Audio, which is an entirely different audio experience, but, you might be pleasantly shocked by the sonic alternatives.  In the price range you are looking at, Deja Vu makes custom systems (vintage horn drivers) that are vivid and alive in ways conventional speakers hardly ever achieve.  The electronics at Deja Vu are also radically different (low-powered tube).

Both stores make this a good location to hear great sound.

I am not a Magico owner, but I can honestly say that my loudspeakers (W-B) required at least 400 hours (almost 4x's longer than the owner's manual suggests before making any subjective judgements) of "break-in".  Fortunately, my preamplifier has a white noise generator input to facilitate this (therefore, time calculations are pretty exact). Otherwise, it is very easy to mis-judge a loudspeaker's real "break-in" period. 

Despite the obvious variables in this fact alone, I wouldn't rush this purchase.  As suggested, get them in your home and play them & assume that they really aren't properly "run-in" yet.

Best of luck