like dem i am biased , however, the boomerangs are unlikey to be reproduced as well again, as the thin line up and alignment made them illegal in the US and other countries i think. Modern manufactures try and make cars that can be sold anywhere, and so the boomerangs should always stand out. But i am biased.
However, I dont think any of them will appreciate like an e30 m3 etc, as they just werent the dynamic class leader when they were new.