I agree with all of the above. These cars will be classics someday, just like a Mustang or a Camaro is today. You can just tell it is by the way it turns heads. Just like a M or a C. if it does that today, on a basically 2004 model no matter what year you have, then you can imagine what it will do in 20 years.

Having said that, 20 years is a long time to have a car sit and not be driven much, that's not a good thing and basically you'll have to double your investment then to get it back into shape. that's dumb too. So better to drive it, keeping it maintained, have the fun of driving it, fix what needs to be fixed and you'll have a MUCH better car in the long run, and get your use out of it.