Which integrated amp would you pick?

Neither, i'd go for a Vitus RI-100 ;)

melbguy1, only one potential problem with your recommendation as compared to the MF M6si. It's four times the MSRP. So instead of spending $3,000 by all means have it your way and spend $12,000. :) 

There are lots of class D enemies here for sure.
I'm not. I haven't heard Parasound Halo integrated, but I like Bel Canto class D integrated amp S300i

I owned the Halo and was quite impressed. Again as stated, a swiss army knife of integrated amps. How some people say it sounded "bad" is beyond me but so be it. I did sell it to fund a Wyred 4 Sound ST500 integrated which I am extremely pleased with. I drive Magnepan .7's which like all maggies, love current. I owned one MuFi amp in the day, can't remember the model but very much enjoyed that amp as well. There are many good choices in your price range so features play a part too. I enjoyed the Yamaha 1000 series as well, not your Mom's box store Yamaha.

@gdhal , there is a Vitus RI-100 on the ’Gon right now with 50hrs. The guy is asking $8k, but you could probably bang that down to $7.5k. Still a stretch, but that would be a really nice upgrade.