Need help building a powerful character.

I'm about to start playing in the Iron Gods adventure path. The group I'm going to be in is full of extreme min/maxers so if I don't want to be left in the dust I will need to be pretty OP also. Normally I would be able to come up with something good but I'm having a hard time with it this time. I was thinking a druid with a strong distrust for technology would be fun for this AP because I'm pretty sure most the rest of the party will be going the other way and wanting all the tech. The big problem I'm having is that the GM is having us use "Recharge Magic" variant casting and I can't understand how this doesn't gimp casters in the early levels and make them super OP at later. Here is a link to the recharge magic thing. http://www.d20srd.org/srd/variant/magic/rechargeMagic.htm

Any help would be great thanks.