Mine is pretty high though. Maybe due to my height, I always like to sit pretty high.
My chair is adjusted roughly about 69cm high (hehe, my fav number) thus in order to have my knees about 100 degrees to the pedal. This is to ensure that i do not stress too much on my knees and thighs and able to play using my ankles. Snare is about 77cm tall.
I think the best height is to not able to stress your thighs by raising your feet up in order to use your ankle. It is the same as using your wrists not having to stress your shoulders in an upper limb context.
Well, this is just my personal preference. Others may prefer to sit pretty low..