oh man LuminousAether has like the opposite of good taste!
mindspell: you really ought to try peanut butter and bacon. amazing!
regarding the vealoaf: no!!! if you put mustard on vealoaf, you MUST use rye bread. ketchup and rye don't go well together, though, so if you want the unique taste of fried vealoaf/ketchup, you regrettably need white bread.
re: french toast: i've never had whole wheat sourdough french toast, but i'm not sure about it. challah, on the other hand, sounds delicious. i'm not saying white bread is superior for the french toast, but that french toast is one of the few things white bread can be used in and still rule.