Like a stereo upgrade... or wheels and tyres... suspension...
Maybe I should just get an extra car! I'm quite impressed by the MBenz collection: I've always liked the rather large 300CE-24 cabriolet. These were very, very expensive new in the UK and are quite rare, but they are becoming affordable; my preference is for the pre-facelift model. Similarly current model W129 (?) SLs are coming down in price. When the new model is released I figure I might be able to get a very tidy SL280/320 for sensible money.
All these dreams put the long winter nights in!