OMG NO GERBILS! I had a pair of Gerbils and they were evil. I prefered my one teddybear hamster over the Gerbil anyday. The only good thing they have is that there more active than hamsters. But hamsters are way friendlier.If possible I would go with gerbils. They don't smell like mice but are as active and they are always ready to play unlike grumpy hamsters. I know you hadn't thought about them but maybe you should. They are very unlikely to bite and the most interesting rodents to watch and play with but that is just my opinion.
I have never been bit by my gerbils apart from one very unfortunate incident involving a lego window. I have not had one hamster which hasn't bitten me and trust me it hurts more than enything else and I have been bitten by a lot of different things.