Get an Iota
30A or 45A charger, with the IQ-4 smart-charge option (internal or external) and don't look back. Either will handle your needs handily. Since there's not much difference in price
, I'd go for the 45A model which will handle your forseeable needs.
Top-of-the line stuff, great technology which few other battery chargers have, GREAT prices, and they'll keep your battery bank in good condition over the years.
You can find them on eBay or elsewhere. JackRabbit Marine
has them, as does Industrial Supply and others. I have two (45A and 55A models) and they're terrific in applications on the boat and in my ham shack.