I've always gone straight recharge bonuses on Elec^3, as it helps get the blaps (and now instasnipe) back up quicker. Basically if I can't Charged Brawl -> Havok Punch -> Zzap -> repeat, I want more recharge. And of course hold stacking, AoEs, and Thunderous Blast coming back quick feels great. It really starts to feel like a true jack-of-all-trades once you reach the point where you can do what-you-want when-you-want, because everything is always ready to go.