Support Question Help! SamSung Galaxy S3 US or International?

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http://androidforums.com – I want to have an SamSung Galaxy S3 unlocked phone. So that I can use it for an unlimited data plan. I'm thinking either Straight Talk or Virgins Mobile USA Unlimited for 35.00 a month. I live in Everett WA. My only question is based on those companies and the plan I want, and where I live and the phone I want, which phone is best for me? The International Version or the North American Version? Which is best for unlimited data in my area with that phone and those companies and data plans. Also as an extra question now that I think about it, is there a cheaper. Unlimited data plan a (General)