Highly suggest http://www.blambot.com/ if you haven't checked there already. Free fonts and articles as well.
Also, agree with what others have said... for dialog pick something that is EASY to read- first & foremost. It could have a more structured or casual element to it, that could mimic your comic's general "feel', but leave the fancier scripts or novelty fonts for the logo or sound effects--- and even THEN, be super careful. Maybe even just an initial if it's an exceptionally crazy font.
Just my 2 cents as a cartoonist and designer