In my opinion - it depends.
In general, a buyer looking at a car that is more than 5 years old is going to care less about the accesories/options fitted to the car than they will about the cars general condition and mileage.
As an experienced buyer of second hand cars, personally I would not pay more for the options you've mentioned - but thats because of all of those options, the only one of any real value to me might be the wheels (if they are in good condition) - the ICE, reverse camera etc, all nice sure, but all can be fitted at relatively low cost these days.
....so, lets say $1000 to the right person... maybe
'07 Touareg V6 TDI with air suspension
'98 Mk3 Cabriolet 2.0 8V
'99 A4 Quattro 1.8T
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