You'll want one who also understands your local law. Even though a lot of things are standardised now (especially within the EU/EEA), a Lithuanian adviser isn't necessarily all that useful if you're not resident in Lithuania or subject to Lithuanian law.
I'd start with looking at the likes of Vistra, Sovereign, Trident, Appleby, Grant Thornton, and other well-established and reputable (but not Big-4) firms. See if they have a local presence in your country.