I need an evergreen bush to go in a extra large pot. One that has some interest
What sort of aspect will the pot have? N/S/E/W -Centre of garden, against a wall; sheltered; exposed; is it to screen; what style are you after? You will get a better answer if you can give a little more detail
South facing, against position in a sheltered position.
I have a Pittosporum tenuifolium in a really big pot for a few years now and it's been wonderful. Doesn't like to be exposed to cold winds so should do alright in the position you have for it, although I've had no problems in slightly exposed driveway in north of England. I heartily recommend it.