I would suggest getting fitted with the clipless pedals. Cages don't really need to be fitted, since your foot position tends to vary quite a bit each time you step on the pedal and most people don't tighten the cage straps appropriately anyway. Clipless pedals, on the other hand, do need to be fitted. I'm one of those people who used to have quite a bit of knee pain due to poorly-fitted clipless pedals. Getting fitted with the clipless pedals on the bike doesn't mean you have to use them, but at least you'll have the option to do so if you want. I, personally, couldn't imagine riding a bike without clipless pedals...