Peach wine- raisins, bananas or grapes for body?

Banana would be a mistake. You'd be left with a thick clingy mess. The best thing to use would be the dried version of the fruit you are distilling, in your case peaches. Think about the raisin for a sec. If you were to cut one in half you could scrape off a sweet paste, the same would happen with the peach. Dried cherries are also good. One of my favorite beverages to make is "cherry bounce"