Battery Charger Recommendation

I have a 98' Carver and the battery charger went bad. I am looking for a replacement unit to charge 3 batteries and wondered what the recommendations are for vendors. There are many out there to choose from it seems. Also, what is the recommendation on what amperage unit to choose. I do have much that runs on 12V when plugged into shore power so I can't imagine that that I would need a large amperage charger for any reason. Do any of you have recommendations?

Thanks for the info. That is what I had was a Charles charger. I had a local guy look at it and the recommendation was that the one I have went bad and took out a LOT of parts which are mill-spec or proprietary and impossible to get. His recommendation was to get a new charger rather than mess with the one I have but that Charles (while very expensive) are good and worth looking at as a replacement. I have been researching a bunch of other companies as well and they all sound good but you know how advertisements are..... Now that the local guy has messed with it I am not sure it is worth sending back to Charles for repair or just get another Charles unit or try something else....