The best speakers to pair with McIntosh MA7000 ?

And take your amp with you when you for demo purposes. Sure it weighs a hundred pounts, but if someone wants you buy $10K speakers in this economy I'm sure they'll carry it into the store for you.

ATC 19s or 20s. They will really dig out the detail in your music.

Match the speakers to your room size.

I own the MA6900. Though I have not heard the 7000, I am told it is identical, except for the additional power, more I/O choices, and updated cosmetics. I have paired the MA6900 with several Sonus Fabers to excellent results. I currently own the Grand Pianos (I like a laid back sound). Also worked well with Vienna Accoustics. Pairing the MA6900 as part of a more dynamic system (B&W Mark IIs) worked worked well too. It's a versatile amp. And, because it is a favorite of many stereo stores, you should be able to audition it or the MA6900 with several speakers relatively easily.

I also own the MA-6900, and have found the combination of a pair of Kef 201/2s and a Rel B3 to be absolutely heavenly. I didn't like the pairing as much with the Dali Helicon 400s I tried, but loved the Totem Mani 2s as well.
Enjoy that awesome amp!