You can ping other owners in the area, see what they recommend.... (you can go to the members list and sort/search based on "Houston", for example.)

I also went to the service managers at two dealerships back in 2003 when I got my first BMW and had a chat- explained what I was like and what I wanted in an SA.

I don't mind an SA that knows less...I expect it. I just demand honesty. and while it will be very hard for most to believe, I am never a dick if they are straight with me.