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If I were you, I'd get the Benchmade Emissary or the Mini Emissary.
Fit all of your requirements including spring assist and S30V.
I ordered this guy the other day. Spring assist isn't the same as "switch blade", and is legal most everywhere.
I ordered this a couple days ago. I've never had an assisted knife before but they tend to have very high reviews by knife enthusiasts (although perhaps for other reasons)