It's my first time to get a menstrual cup and I don't know which to pick. I can't get a hold of a Moon Cup (UK) because I'll buy it internationally from ebay. I am choosing from Ladycup, Keeper, and Divacup. The size I'll get is the smallest. Which do you think is the best cup? Apart from those other brands, what other brands are worth mentioning? All of them are made from allergy-free latex materials right?