Sounds like you already have a good handle on the differences. Opus gives you the textured back and sides, and only one color choice (black). They try to keep a few around, so it will ship quicker than waiting for a custom build of an Artisan. I don't need a pickup, but since I want a green Chimaera I will have to go Artisan - when the time comes.
Apart from the gear ratios, either model of Gotoh tuning machine should be fine. A lot of people like the 510's, but only you can decide if the cost differential is worth it to you.
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