I used to collect 1:18 scale models but ran out of space. I have the folowing ones:

Porsche 356 Cabriolet
NSU Prinz
MB S-Klasse W220
Jaguar XK8 Convertible
Alpine A110
Auto Union 1000
Jaguar Mk II
Citroen DS
VW Beetle 'Coccinelle'
VW Kleinbuss
Fiat 500

Also I have kept all my toy cars from my childhood. I have about 350 toy cars of different scales (under my bed!).