Use good Marsala wine for your Veal Marsala.
Italian-style Veal Marsala calls for dry Marsala wine. They should know, Marsala is a Sicilian fortified wine. And please, don't use any bottles that are labeled cooking wine. As a general principle, if it's not good enough to drink it's not good enough to cook with.
In addition to the wines mentioned in our food pairing table you might consider a Chardonnay, a Chianti, or a Pinot Noir.