Hero System
Hey Willis, I have played and GMed Hero System for the better part of 20 years. The Hero System is hands down the best. With enough patience and perserverance, You or you players can literally create ANY powers, skills, talents, or special abilities you could dream of. The only downside is that you are in for a lot of mathematics. Nothing difficult, just a lot of number crunching.(i.e.-the more complicated the character, the more math involved.) Just remember, as the GM, YOU SET all the limits. You can allow or disallow any set of powers, skills, etc., if you feel they may unbalance your game. You can also set "house rules" as long as every PC agrees, simplifying rules and the like to streamline your gaming experience. The Hero System in infinately expandable, only your fears can hold you back.