If you were using an unbalanced system before, it was likely pokemon tabletop adventures. Fun but really wonky and vague in areas. PTU is an updated version that runs much smoother and allows for much more variety in game play options, like settings and campaigns.

http://www.mediafire.com/?ss8xoof408j8swj

Here is where you can download the main pdf and the supliment setting guides:

Pokemon Tabletop United Game Guide
Game of Throhs: Fantasy Setting Guide
The Blessed and the Dammed: Legendary Guide
Do Porygon Dream of Mareep?: Sci-Fi setting Guide

Along with useful charts and of course the Pokedex. It can seem very detailed and confusing at first, but you dont have to know every edge and feature to GM a game. Just the rather simple mechanics. 

If you find it interesting and have questions, I'll be happy to help!