in actually fact very few Japanese cars have made it. well I had a Honda s600 -that was collectable but not as good as the s800.i also had the Datsun 2000 sports too but again high screen so not as good as the low screen model.
in actually fact if I had a garage full of Japanese collectables it would go as such and I am only going on actual cars I sat in when new - mazda r100 - Datsun 240z - Honda s800 - Datsun 2000 sports low screen...all late 60's /early 70's and well under or about $3000 when new.
out of those 4 id pick the mazda r100 as it was well ahead of its time with the rotary motor and the way out drivers cockpit and overhead console. although the Datsun 2000 is a close one. a 200 kph 2 litre in 69 was faster than a 6 pot and equal to a ford V8.
but in general collectable car are the ones in original unrestored and unmolested condition - mine has been heavily molested


but what I can do is after 6 odd years of the artic white give it a change of colour and I think the contender are or could be
1. two tone silver/titanium
2. the dark horse colour - possibly lava orange
3. titanium