Been looking online and I think I might end up with a metal building, a carport type, I THINK. I can get a 12x21ft with 6ft legs, installed for $895 plus tax. I still need to sit down and layout my pole barn version and get material prices. While we are not considered a rainy area, by a lot of people's standards, we do get some big storms (for CA). We have one with an expected 6-10" this weekend.
Storms like that can and do soak dry wood to the point it is unburnable for a long time. I agree a couple years ahead is ideal around here too, for good burning wood. If I go with a carport style I will vent the roof.
I do have some ideas for solar heating to speed up the drying process too. Right now they are ideas. During the summer, I can get by with a roof fan, just pulling air in and up. During the winter I can make some home made solar air panels to pre-heat the cooler air. I will most likely do all this because I want it mostly enclosed, or at least during rainy season. I want removable sides.