You can do the same with 30 mins in the Pitts/Extra as you will do in an hour in the C150. The Pitts & Extra rate of climb and ability to do thing without losing height will make them more cost effective.
The front seat in the Pitts doesn't have great visibility, wheras the Extra has much better visibility.
I suggest popping along one day and having an ask to sit in them and make your choice then.
Both Charlie at Sibson and Luke at Cambridge will make sure you get well addicted!!!!
ZA