Bad idea Muffin! It would really not be good to a) keep a pair and b) breed from them. They will almost certainly be hybrids and could carry genetic issues. Also the cage wouldn't be big enough for a pair. Have a look at the article on the home page about not keeping dwarf hamsters in pairs. When hybrids breed, sometimes the babies are too big for the Mother to pass and it's an agonising death.
If you're getting two then you'll need two separate cages.
It would be better to just get one. Bonded pairs aren't really bonded and wouldn't stay bonded. Once their hormones kick in, or with the slightest change of environment, they would fight and one could either be killed or seriously maimed. And then you'd have a very big vet bill for surgery. Apart from the distress for you and the hamsters. Also there is often bullying between pairs with one staying smaller (the bullied one). They will be fine living alone and being separated.