I have a system in practically every room because for some reason I don't sell any of my old stuff unless they become redundant. So anywhere here goes in order of most to least used.

Von Schweikert VR-4 Gen III SE (sold) awaiting delivery of Gen IV SR
VR-4 jr currently on loan and filling in (main system)

Von Schweikert VR-1 (chill out system)

Maggie 1.6 QR (HT)

Maggie SMGc (Bedroom)

Revel F30 (For Sale along w/C30 formerly HT)

Dynaudio Contour 3.4 (HT vacation house)

Dynaudio Contour 1.1 (Bedroom vacation house)

Dynaudio Contour Sub and Audience Surrounds (HT vacation house)

Energy Surrounds and Sub(HT)

I guess that's it if we don't count the office baby sytems 1 FPS and 1 Acoustic Energy AEGO2

Oh. Poolside B&W LM1s

So 7 brands.