Soldato
Do it.
To be fair, reading the above it seems like you want one specifically because you want one, and not because you think it's a premium daily driver at a budget price or some sort of badge self esteem boost.
As mentioned earlier there is a lot of things that can break, this isn't because they're an unreliable cat but because they're old. Same as any old car. Go in with your eyes open and accepting of it potentially throwing up faults at any given time and you'll be fine.
I assume that, if you like older cars, you're happy enough to crack the spanners out yourself? Being willing to do jobs yourself will be a massive money saver too, they're not complex cars mechanically, hell I manage with a similar age BMW (Same engine, different model)
I've just spoke to a mate from our indie garage and he's said stay away from the SMG's as it will cost £1600+ to fix.
Also, I have another car which is garaged and is more of a toy - its a Volvo 850 T-5R estate.