Like WV Hunter said the pro series are the bows that a PSE dealer carries in his/her pro shop while the other pse bows are ones that can be found in Cabelas and other similar places.

The dealer I work for is supposedly the largest PSE dealer in NY. He carries bows such as the Diamondback II, Beast Inferno, Outlaw, Deer Hunter, Beast S7, Primos STL, Nova, & Triton. Bows such as the Baby G or the Firestorm can be found in Cabelas.