Assuming a sum of £150,000 had miraculously become available to be spent on aviation. The intention would be to spend £50,000 on a post-1990 Socata TB9 (“horribly underpowered”, I know, but on the other hand all TBs “prior to 1989/90 are known for serious corrosion issues”) with the remaining £100,000 hopefully covering running costs over the next 10 years.
Question: How realistic, in financial terms, is that?

Other a/c options considered, but the following are non-negotiable: low-wing, non-taildragger, has to live outside. A fuel-injected engine would be nice!