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as mentioned above you will definately want to run their guided series of belt. these belts come with a self-aligning nub and mate to their own brand of pulleys designed specially for the belt. we skipped their pulleys because of price, and instead got a print from their engineers and machined our own. much cheaper if you have the resources!
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You don't have to buy a belt from there self centering series of belts. You can put a solid tracking bar down the center of almost all of there belts (except the generation 3 series). It costs a little more than buying a catalogue tracking belt, but offers more options with what you get.