Eh, really it doesn't matter that much where you put your stats if you ask me. If you spread them evenly, you're bound to get outclassed on all fronts. If you focus on being a fighter, any mage or archer can nuke you from afar. If you focus marksman, you're screwed in close combat. If you focus mage, magic nullifying screws you up. There really isn't a way to make your character impervious, which is a good thing. 

Thanks~