I have only been on 3 B&M Inverted coasters.. I'd rank them like this:
1. Black Mamba - Phantasialand
2. OzIris - Parc Astérix
3. Monster - Walygator Parc
Because this topic is called "Best Roller Coasters in the US (By State) or Country", I think this also counts for countries. I have only been to parks in 4 countries in Europe. This is my list:
Belgium: Anubis: The Ride - Plopsaland De Panne
France: OzIris - Parc Astérix
Germany: Schwur des Kärnan - Hansa Park
Netherlands: Goliath - Walibi Holland
S&S has released a design for their power tower where the car (or tower?) will rotate before the car gets shot towards the ground. Take a look at it here.
I think the car will rotate. Pretty cool idea, though.