What size boat, how many toys on it, how do you sail? If you have a boat that stays on dock power in a slip and you day sail, then what you've got is fine, if you have lots of eletronics and you cruise (and you've got refrigeration, stereo, fans, electric head, etc.), then look at changing what you've got.
Paloma sits in a slip hooked up to shorepower, and when we sail, it's ocassionally in the bay, but mostly offshore, and fairly short trips of 150 to 650 miles, I have two West Marine dual purpose flooded batteries and they do just fine. I changed from four batteries (two big deep cycle house and two starters) on two battery chargers and running through two battery switches - realized it was overkill for what I do and when the four batteries needed replacement a couple of years ago, I made the change.
s/v Paloma, Bristol 29.9, #141
Slipped in Bahia Marina, easy access to Corpus Christi Bay and the Gulf of Mexico.