Best - Has to be the Black CCSE, it's the only car I've enjoyed more than the Bikes I used to love!
Worst - spoilt for choice really, Minis (original), Maestros (including the talking computer one, wasn't that the 'vanden plas'?), Metro's, Montegos (with two rear facing child seats) I've had em all. For some reason I kept changing one heap of old scrap for another (maybe it was cost!).
However I must sing the praise of the Austin Allegro Estate I had about 10 years ago. It cost next to nothing, never let me down, had nearly as much boot space as my Galaxy, and I got more than I paid for it when I sold it. Ok it handled like a drunken camel and struggled to overtake milk floats but you can't have everything
SimonT