A tip from Sue!
Beware cooking wine!
Never use a "so-called cooking wine" that's marketed specifically as a cooking wine for your sauce. Only use a wine that would not be objectionable to drink by itself. In lighter sauces a good one to use is a nice Fume' Blanc or Sauvignon Blanc. In stronger red sauces, use a decent red wine such as a Barolo, Zinfandel or Cabernet.