I've had some great McIntosh auditions lately... The MC402 + C2300 heard at Audio Lab, Harvard Square MA, made the Gallo 3.1 that I recently bought (still being delieverd, can't wait) come alive with amazing authority, dynamics and control. Very musical sound, and I really wish I had the $13k or so to afford the pair.
I haven't the new pass .5 series, but I think the McIntosh would match really well with Dynaudio. I used to own the S1.4s, so I'm pretty familliar with the Dyns.