Bavaria in General
I have no direct experience with the "Ocean" series or center cockpit Bavarias. I do own a Bavaria 36 cruiser and I have seen several "Oceans" and talked to several owners at the rendezvous. They are great boats. The only problems I have heard of include: leaks from the portlights or hatches, stiff rudder bearings, leak from "stanchion flex" at the hull to deck joint, and some engine issues.
My advise is general in nature. Look over the boat carefully including in all storage areas, bilges, behind access panels, etc. Operate all systems like everything electrical, the head, pumps, etc. Do a good sea trial and operate the engine under load for a while, sail the boat on all points of sail, and if you are happy, then hire a good surveyor to go over it with a fine tooth comb. At that point you should have a good idea of what you are buying. Overall Bavarias are good boats and are capable (with modification) of going off shore, but they wouldn't be my first pick as an off shore boat. Coastal cruising is where they are very good.
Good luck and let us know what you decide,
Tom