SF260s are lovely, but hard to come by.
A good Bulldog can be had for around £40k, and a good T67M200 or better still M260 for around 60k, both would appear to meet your spec for a good aerobatic and touring capability in a tourer.
I can't think of anything that has a radial and will meet your spec.
The perfect aeroplane for your spec may be a Pilatus PC7, but that's going to be nearer £700k so presumably well outside your budget (and mine very sadly!)
Given your budget, why not two aeroplanes? A good 2-seat or 4-seat CofA tourer that you can rent out - perhaps a Turbo Arrow, and a permit aerobatic aeroplane such as a Pitts for pure fun? Those together will probably still give you change from £100k
G