I have some 1.5kg and some 3kg ones and am looking to increase but I'm not sure how large a jump I should make. An anyone recommend? I was thinking of 5 but I don't know if this will be not enough too soon. I don't have endless amounts of money to spend. At the moment they have 5, 7 and 10 in stock. Would a jump from 3 to 10 kg be too much? Or is it a case of go for it and try?!