Andy Haskett was pretty good, but way too passive, IMO. Doug Newsome was much more demanding but great.
Hands down though, Walton Rothrock (French) was the best. of mine. Natural teacher/leader, comfortable with kids even though he was probably 70 when he was teaching my classes, and demanded high standards of performance without demeaning his students. Class act, all the way around. His favorite line was, he intended to keep teaching as long as his dad's money held out.
(Dad owned car dealerships)