Might I recommend spending the feat to buy Exotic Weapon Proficiency: Bastard Sword, if that exists (sorry still learning pathfinder, still mostly in 3.5). You can wield 2 handed, but release one hand as necessary for spellcasting while only sacrificing a slight damage bonus.
What you trick the blade out with is another matter. My Red Wizard ran around with an Adamantine Bastard Sword +4 Defender, Skillblade with a wand reliquary in the hilt that he usually kept a wand of fireball in. (Skillblade granted proficiency in the weapon, and a clerics BAB)