Welcome to the Bay Area! I'll just point out that there is a good Korean BBQ buffet down in Sunnyvale (which is nearby Santa Clara, not to be confused with Santa Clarita which I believe is down in SoCal!) by the name of Palace BBQ. But that is a good distance away from Vallejo. I don't know of any good Korean places up in the Vallejo area though...
http://www.yelp.com/biz/palace-bbq-buffet-sunnyvale