Where is the American Top Team gym?
Yeah you mentioned UTC and Ultimate Fitness, so it sounds like you are looking all over
www.Marinobles.com
They do kickboxing and MMA, as well as some traditional MA stuff. Couture and Rmapage have trained there and Marinoble trained Urijah Faber early on. They're in Roseville.
http://www.muaythaithaiboxing.net/
Andy K's gym on Northgate Blvd. Just MT kickboxing, but the best in Sacto I'm told.
www.bruddas.com
Bruddas Brazilian Jiu Jitsu. They also have MT classes.
www.cassiowerneck.com
Cassio Werneck's BJJ school.
http://www.groundworksjiujitsu.com/
They teach Rickson Gracie JJ. Not too far from downtown. I dont know anything else about them.
I hope that helps. I'm actually in the market for a new gym too, so let us know what you decide!