The whole point of circling approaches is poor weather approaches to non-precision runways without aids. Therefore circling should be flown at 1200' circling minimum, but there is nothing to stop you doing it higher at whatever you are comfortable with. But ATC may be expecting you to be at 1200' in case you affect one of the other approaches being flown by another aircraft. Bear in mind go-around procedures on circling approaches- follow what is printed on the Jeppesen however it looks!