Ringing Ceders

We are not really happy with the system that we currently are using for inventory, so we are looking into getting a new system. Can anyone tell me which company makes the best supermarket POS system? Hopefully I will get some recommendations that I can use to narrow down the choices a bit. I suppose what I really should be asking is which systems people wouldn’t recommend, so I could avoid all the ones that other people are having problems with. Having already dealt with one system that didn’t work out well for us, I am not looking to have the same problems again.