@Gregory ********
okay, once you get the 90 day Non-O visa granted, THEN you need the money seasoned the 2 months before you apply for the yearly extension.
IF you are getting the extension based on marriage you will get a 30 day under consideration stamp on the date you apply for it AND the immigration office (at least in Bangkok) will tell you to leave the 400K baht in the account, update your bank book on the date you return to get your year extension inked in.