My wife has a stain color that she likes. I forget what it is right now, but will post when we get to that point. I'm debating if I want to do anything else to it or not. I'm not a fan of a shiny, glossy look. I've thought about oil, but haven't really compared what's out there. I have a few different brands on my shelf, so I'll read the labels and see which is best, and then do a test to see if we like the results. Or maybe a sealer that doesn't have much of a sheen designed for the outdoors.
I'm going to build the cabinets too, and will probably stain them darker then the ceiling, and probably put a couple coats of sealer on them to protect them, so maybe the ceiling will get the same treatment.