I build cars for myself not for others, I can normally appreciate the effort that goes into any build, but bog standard cars bore me silly
Nice period modifications can really improve most classic cars. However, I can't say that a true bog standard classic should bore anyone if they are a true classic car enthusiast. A standard Mini is always fun and will give a real 1960's retro drive in the same way as a Cortina or other car of that era will.
Personally I can't see much of a future in spending a lot of money actually de-valuing a classic car by fitting non-period stuff, but if one can afford it then I guess that's fine. If I want a fast car I don't want a classic Mini, I want something really quick which will only cost me what a classic Mini will cost (or even less).
A classic Mini is just that, an old, relatively slow but truly iconic and retro car which period modifications will probably enhance even more. I know the big values are in the early Cooper 'S' models, but the truly iconic Mini is arguably the early 850, which is where it all started. They just look so right and so 'clean'.
Personally, Ive got a thing for completely standard, unmolested (except for swapping front drums for 7.5 discs and a stage 1 tuning kit) mk3 1000s. Theres something about their about their basic-ness and uncomplicated looks and nature that appeals to me. And in my experience of driving a standard mk4 1000 (except for 1275 engine), I get more people looking at my car, asking about my car, giving massive compliments about my car, than I did when I used to drive, 90s Coopers, 90s heavily modded (boy racered) 1000s/1275s. People just seem to appreciate a proper Classic and I have much more fun driving it.