I've never had a gamo. On the online forums folks claim they aren't any good. I'd imagine you would be paying for that logo more than anything. I think the benjamin/crosman are supposed to be another chinese air rifle with better quality control.
Personally I like Beeman and Diana RWS (Dynamit Noble). Be sure to read up on what you are buying though. Springer rifles are generally hold sensitive. Meaning you have to hold them a certain way to get consistency. Leaning on a tree or shooting from a porch rail will often throw them off. For the average hunting type fella I'd recommend the benjamin sheridan pump rifle. 17 for feathers 22 for fur. Not an overly powerful rifle but will take squirrels and rabbits at hunting ranges and opossum and raccoon up close. They are pretty accurate for target shooting as well.