Alright I bought it! If it's good enough for Mark-Frakkin'-Bremmer, it's good enough for me :)
After playing around with Toon Pro for most of last night, the only issue I'm having is how it handles transparency maps. The plug-in seems to want to outline the actual geometry of Poser hair, eyelashes, etc.
Any advice on this? So far my best bet is too override the Toon settings for anything with a map in the Alpha channel.
You guys rock!
JT