I'm a big fan of the Interstate ones. I had a Megatron in my old 3rd gen for freakin ever (7ish years?), so I went with the 27F from Costco too. Although, that being said, there was a 27F in there from the previous owner, and everrryyy time I'd take my truck somewhere to get an alignment and they'd scan the battery they'd say "OMFG IT'S GONNA DIE ANY DAY!". It lasted two years doing that, and I had a battery back up for when it finally died after having my radio on for a couple hours (so it probably still had some life in it). I'll say it's a lot quicker to start now though in the cold.