I urge you to try Tamari. It's almost the same as soy sauce, only instead of a powerful punch of salt and soy, it's subtle and complex. Use it by itself as a soy sauce replacement, or blend it with mirin and sake for an incredible teriyaki base.
My go-to soy sauce is San-J Tamari — I love it. I’ve also splurged for $30/bottle aged soy sauces. There’s just something about a good soy sauce that makes me happy. :-)
I haven’t mixed it with mirin, but I will definitely give that a try! Thanks, Jeff!