Or you could buy ArtRage Studio Pro for 59 bucks:
http://www.artrage.com/artrage-studiopro.html
and have a set of some of the best natural media tools out there,
and you can record your animations from a Wacom tablet, bring them in to AE, then do what some of the answers above suggested - I particularly like Unmult - use it all the time.
Joe Bourke
Owner/Creative Director
Bourke Media
http://www.bourkemedia.com