Visa exempt, 30 days for free then extend at immigration for 1,900 baht for an additional 30 days. If you don't have a history of abusing this system and haven't been to Thailand dbefore that's the most convenient way to do it
Todd can you please clarify, with a Non O based on marriage, from what you say above it is possible to get a one year extension with no seasoned funds if you are supporting half Thai children?
I'm far less knowledgeable on visa related issued. Hence being member of this awesome group. However I knew exactly what she was talking about with "Thai wife visa" - just saying what I see.