When I asked Sanjay about electronic ballasts, he told me there is very little difference in performance between them. IceCap, ARO, Vertex are popular brands and easy to find.
I went ahead and ordered this from reefgeek. Basically I got it for just a little more than the price of a single ice cap ballast, and the reviews seem pretty good for it. I like the idea of a dual unit since I have a dual bulb fixture! I'll post a FTS when I get it hooked up and see if its any brighter than the old cheapo ballast.