Ken,

Everything that was already said.

You need two cards--one in your personal name for personal expenses and one in your business name for business expenses. In order to make it easy to tell which is which, spend the $5.00 (or whatever the fee is) and get custom cards made. Have a business-related picture, such as your business logo, put on your business card, and have a personal picture, such as your wife, kids, dog, on your personal card. And unless your wife works in the business and has actual business expenses, don't give her a business card.