Best fun investment car for £5k-£10k

[Captaincheese]

I have been toying with buying a fun car to put in the garage and use sparingly. For my man maths it would be good if I could pick something that might appreciate slightly if held onto for a few years.
I am not looking for some sort of stripped down track car. More something that might get the pulse racing a little and be engaging to drive, but be at least 10 years old and have some character. Ideally want something as the factory made it rather than anything modified. I also want at least 4 seats so that i can take the kids in it if required. Also looking for something that isn't too fragile, as I don't have fortunes to spend on maintenance....so not too big a wish list then!
Got my driving license in the early 90's so am drawn to some of the hot hatchery of that time, although recognise that the boat has probably been missed for the 205gti and 5 gt turbo stuff.
Current thoughts are:

E46 M3 (manual)
Golf GTI mk2 16v
Volvo v70R
Jaguar XKR
Subaru Impreza STi (although not sure about this)
Alfa 156 GTA

What is conventional thinking on these and what would anyone else suggest?