Yes, I feel like in my situation, with all the winds, I'm going to be pushing for the metal. I'm not sure what the insurance company would do if my metal roofing came off in a tornado, for instance. I'm pretty sure they would replace my roof, just not for the price of the metal, rather for the price of the other materials. I will have to double check with them on that. As friend that sells the metal said, you would think they would WANT you to put metal on, since it lasts longer than shingles, but then it can get damaged by hail and large tree branches.
I will definitely have proper ventilation on my new roof. This whole house was built with "cheap" as the main adjective, I'm finding out more and more. And, the former owner probably is who put on the last roof, and they are simply too lazy to do things right. The concrete pieces (areas here and there) poured here are unbelievable. I have a 6" jump on the right hand side of my garage, narrow pad in front of my pad has dropped that much on that side, only 1" on the other end. Just wasn't done properly. Glad my car goes in the middle, only 4" drop for the right hand tires.
Mitch, I had to look up "leeward". I'm confused, though. Seems it is saying leeward is away from the wind, facing the side that gets less wind. I would think I would want more air flowing into the vents, or is it this way to keep the wind and rain out of the vents? If the vents are all the way along the roof ridge (I have a simple gable roof), then the openings would be on both sides, East and West (west and NW is the direction my prevailing winds come from). Only time I get east winds is when something really bad is coming ... like tonight!