I have had a pair of AGM batteries from West Marine that have lasted about 5 years, but are not as strong as they once were. I believe I want to go with AGM's again (group 27), but anything that size that I can get 5 years or so out of would be fine. Just wondering where most buy batteries around here. I paid $300 for the pair and would like to keep it around that. My Port Supply discount is not as good as it once was, since I don't spend thousands at West Marine. Thank you for any input.