I need some advice on hamsters.....?

Ok... so about 9 months ago I adopted a pet hamster from a local pet store. I had intended on making her my daughters' pet, but instead I ended up taking highly to the little creature. Last Tuesday, we came home to find her dying in her cage. I scooped her up, wrapped her in a little towel, and held her and cried hysterically for over an hour before proceeding on with our little funeral. So now my daughters and I have adopted another one (this time we adopted a young one so we'll have more time with him). My heart is still aching and I'm thinking of going back to the pet store and grabbing up another one. But my question here is would this be a smart move? I wouldn't mind taking care of more than one (they're so low maintenance and very sweet animals) but do they make better pets when they're the only one? I have tried asking the pet store clerk and she said it could be done but to make sure we keep them in separate cages to avoid fighting or unwanted babies. I just don't want to be pushed into this for the sake of a sale and I don't want to traumatize an animal by bringing it into my home only to decide later on it isn't working.