For me, something like the Absolute Inferno or the Hybrid DirtyBomb. Gets through the heads with ease, strong midlane roll, and a nice strong arc off the back. A very versatile reaction that's easy to control and offers optimum carry on a wider array of conditions.
Another thing worth noting, I'm a big fan of bright logos and I'm sure quite a few others are too. Makes it easier to read the ball going down the lane as well as making it more eye appealing to the crowd. As we know, visualization, altough it shouldn't, plays a big part in choosing equipment.
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If it weren't for electricity we'd all be watching television by candlelight.