I too would not suggest roborovskis as they are so fast, hyper and often very nervous. If you want dwrafs try winter white dwarfs or russian campbell dwarfs. Once tamed they make great pets! All of my current dwarfs brux (just like rats) and groom me. C= But it seems as though you may have gotten the robo's already.
I would suggest going for a tank or a bin cage(google it). They are hard to escape from and provid elot sof room. A 20 gallon long aquarium or a bin cage close to the same size would be the perfect size. Hamsters need a lot of room even though they are small. If you do get a pair fo dwarfs you will need two wheels, a few houses/hidey places and a large enough food dish for both of them to be able to sit in.
Dwarfs are prone to diabetes so it is best to keep them on a diet as though they were diabetic. So no corn, peas, carrots or fruits and no store bought treats. They all have to much sugar. My hamsters hate the lab block diet so I keep them on a seed mix diet. I like harry/hazel hamster I just pick out any corn and peas and then most of the sunflower seeds, pumpkin seeds and peanust as they are fattening. It takes me 10 minutes to feed nine hamsters in this manner.
