A few of the Metro 6R4s can go for very good money. Eg. Ternco livery.
The first type of Scaley Metro was quite a decent car, it was spoilt later by the flared arches & cheap paint jobs on the 6R4.
There were loads of Mini Coopers made, some are very common, others are not, in particular versions made in the 60s & early 70s. Some of the later colour schemes are now also becoming collectable.
Cheers
Kev