Only other choice really...
is to go with as many AGMs as you can afford. Next to 6 volt flooded, AGMs are about as forgiving as any, relating to charge rates and not "melting down" with too much of a charge. They are smaller, lighter, can be mounted in most any configuration, and will put out more amp hrs. than anything on the market. Are they expensive...yes...are they worth it...yes...if you are going to use the boat?! Check out Cruising World, Feb. '07 issue for a fairly informative article.