Two important ones; both of them are integral to the "who" of who I am.
"Complementarian or Egalitarian?"
Search this blog for "gender" issues, I am a firm Complementarian - this is a deal breaker. I am convinced from Scripture that the husband is the head of the wife, as Christ is the head of the church. That Christ is the role model for a husband's love, and the church is the role model for a wife's submission.
"Reformed? Or what?"
Not a deal breaker, but darn close. I want a home of peace, and I cannot be at peace with somebody who is constantly at war with my beliefs.