The worst thing about the C150 Aerobat is the name - It's about as aerobatic as I am athletic. It's not a bad aircraft all told, but doing aerobatics in it is just plain wierd - it scraped through basic manouvres but I just couldn't get a feel for trying to do aerobatics with poor all round visibility and - FFS, a yoke.
Robin is a good call I think though not flown one. I know plenty of people that will vouch for the Slingsby as a good aerobatic chariot as well as a handy tourer.
Chipmunks are lovely if you can find them - I know of a few groups actively looking for them at the minute and they are like hens teeth, and quite expensive to boot.
I loved flying the G115E, but having spent 15min on google a stick equipped one (D or E model) looks to be as rare as the aforementioned chipmunk and have been selling for fairly strong money. It'd make a good IMC ship too.