I still feel upset about the prototypes that were at MG Rover when they folded in 2005. A few of them could have been saved and made road legal for not a lot of dosh.
Obviously the success story of it all was the pre-production 75 that is well-documented about, that managed to escape the crusher.
If I had a choice then I would have saved the 75 Tourer that had the Land Rover Freelander 4x4 drivetrain attached to it (I think). That would have been a lot of fun!