OOOhh i def think you will end up a lot more bigger than a dd, as you are already a c cup to start with. I was only a 34b and had 340 overs and now measure a 32e-f. So i think you will end up a ff cup for def!!. If i was you go for the 410!! cos they will look fab! plus the bigger size you have the better as it fills out any excess skin, making them plumper and harder looking. Mine are ok, but i really wish i was offered bigger, so i cud have biug hard boobs, mine are really soft and natural, a bit boring ha ha XX BIGGER ALL THE WAY!!