okay, well, since im not too advised in weight and types of chains, i will tell you how i worked it out. For me, i started with some light weight things. 6" glowstick with ribbon.. didnt weigh much at all. My advice, use whatever you think looks funner. Your arms will adjust to swinging its weight, it isnt much of a problem, if you practice a good amount of your time, youd be able to handle many weights. Im sorry if this doesnt help :P lol but i hope it does. At the moment i use L.E.D. sock poi from HOP's shop, they weighed too much for my tastes, but as i worked with it, within a hour i learned how to spin it easily, again, sorry if it doesnt help...

have fun spinning