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Definitely get the newer ones. Older releases has proportion problems. The Showa Riders are still okay so maybe Sakurajima ver Rider 1? Still easy to get I think.
Personally I like ZO. Black renewal version is good. Rider 3 is pretty cool figure too. I think you can tell I'm going with the more iconic grasshopper based designs. If you are getting just one it must be grasshopper based.