Hi Kev
All the previous posts have raised some interesting and valid points about the various aerobatic options. Another thing to consider is a longer term view about cost, availability and what YOU want. Let us imagine in the future you want to take your friends, wife, parents for a few aeros they would be more than happy with a couple of loops and rolls. The much maligned cessna aerobat would be perfect for that. Also if you only wanted to do aopa basic manoeuvers it is also perfectly acceptable for that. You should have no problem with currency becauce it is just? a 150. A previous poster claimed that it actually more cost effective to do it in the pitts, well there is another organisation at wellesbourne using a Reims aerobat with parachutes doing the aopa coarse for 880 quid. I know it sounds too cheap but it is there feel free to pm me if you need the details. If you speak to any of the guys that fly it you may be surprised at the positive feedback. There is a lot of choice out there try them all and see which suits.
Regards
deed