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If your only concern is "show accuracy", then there's the Impact Model. It has an inferior sculpt and articulation, but it's the most on-model articulated figure out there. It looks ugly, poses like garbage but it follows the exact proportion of the spec models.
The Revoltech has a much, much nicer sculpt but the proportions are fudged to be more dynamic. This could work in your favour as when it's posed, it sort of captures the heavily distorted proportions of Gurren Lagann when it's in motion. This is by far the best option.
I strongly recommend the Riobot regardless. It's a marvel of engineering and absolutely beautiful.
