Yup, your right I got the reg wrong ! I think £ 150 an hour wet is very high. My school currently rents out 300C's ( 1990 or newer ) for £ 195 hour wet ( plus vat) and thats before you get a discount for a block of hours.
The C model is streets ahead on an A eg 2 x 16 stone people 49 gals of fuel and still do a towering take off plus an 80 kt cruise !
as already stated watch the t/r it will give you a nasty surprise in a moderate wind !
All I would say is why buy and have a running cost plus hassle greater than being able to rent ?
Best of luck, PM me if you want more info