Hoping someone could give me some experience/feedback on the 80s Charvel models, specifically 2-4, I've heard those are the best ones to look out for?

What is the difference between USA/Japanese models? Which is best?

Why on Earth does model #2 only have a humbucker, and should this affect its price?

Kahler or Floyd?

All thoughts appreciated, thanks!
The reason for single humbucker charvels is just that they're plain badass... and everyone in the 80s wanted to be evh who used single hb guitars.