Which integrated amp would you pick?

I don't know which Musical Fidelity you are speaking of. There is an M6500i and a M6si. Perhaps there was an M6 before this???
I have heard the M6500i. It is a dual mono design and it sounds truly amazing for an integrated amp. It will sound better than many mono amps paired with a preamp.
I have the Parasound A21 HALO amp and P3 preamp, which should not be that different than the new HALO integrated. This combo is as good as the MF, I think. I would listen to both the MF and the Parasound for comparison using your own ears.

Of course the speakers you will use should make a difference, but both amps have ample power. I would give the edge to the M6500i.

I have not heard the M6 but have owned the A3.2, A308, KW500, and NuVista 800. I really liked all of them. The KW500 was fantastic (still have it for when I put my second system in place). The NuVista 800 is truly world class in my opinion. However, I have not heard a Parasound amp for several years now--I did like it though I can't recall which model. I agree with 2psyop. Listen for yourself.  When I started out, I spent countless hours listening to LOTS of gear at several excellent local HiFi shops. I identified a sound that appealed to me and have built on that sound, following the mantra of "same but better," as I have changed gear. It has served me well. I love my system. If you have questions about MuFi, contact Randy Bingham (in charge of US sales). He is very helpful, knowledgeable, and a nice guy.

@2psyop - are you saying that that $3500 of Parasound (A 21 and P3) separates are as good at the $7,000 M6500i? That would certainly swing my thinking towards Parasound, although I haven’t heard the Halo Integrated. Just curious, as I’m in the market for an integrated but am also considering looking at separates.

Thanks, Scott

Thanks everyone for their input...and yes I specifically asked about the Parasound  Halo. Thanks George and stereo 5 for your experience with this integrated.