Not sure I should be encouraging you!
Maintenance was reasonable as long as you use an Indy. Bodywork of my period (86) prone to rusty wings (not as bad as Mercs!) and not any more expensive than any other bodywork. There is a lot that can go wrong with things - hydraulics etc, but the engine is pretty unstressed. Mine broke down once when I ignored the aircon compressor playing up, which then shorted. Easily fixed by the RAC, apart from that, no great problems, just buy the ones that have been well looked after, have it inspected, a lot of people try and run one on an inadequate budget and think the quality of the car will mean it needs little servicing - the fatter the file, the better (within reason).
They are imposing cars, very heavy - don't be fooled by my long distance mpg, around town 4mpg was normal! Built by hand with a body that flexes, they do creak a lot. My insurance (garaged, second car, classic) was peanuts for the type of car.
I would go for one post 90 - build quality definitely better, a four speed kind of useful.