All other products that claim to add bacteria are full of mulm. And certainly avoid Cycle, because not only does that stuff claim the bacteria crap, it also says it should be used with every water change.
(Well, um, Hagen...how about Cycle doesn't have any necessary use at all?)
Back on topic, if you're looking to cycle your tank and you're not in any deadline or hurried situation, there's no reason to spend money on a product.
Bio-Spira is supposed to work, so I'll agree with homebunny and recommend it to you, but I do want to remind you that nature will cycle your tank for free if you have the time to let it.