Thanks to all - A and C - you are right, its either going to be a TB20 or R114 but I will give a Saratoga a go too, just becuase its a Piper and I am still relatively low hours.
englishal - thanks - would you really recommend TS as the next step up from a Warrior (bearing in mind I'm just over 100 hours total) - And i thought it was a piston engine, not a turbo prop?