A dutch standing seam with 3/4" purlins and EPS insulation can't be beat.  The material costs a bit more but is a fairly easy DIY job, and realistically its rated for 50 years.  When shelling out big you just have to remeber you get what you pay for.  Compare the cost of two 30 year shingle roofs to one metal roof and its a no brainer.

My last serious discussion about roofs was with an extension guy for North Carolina's sea grant program.  For the Outer Banks, he was happy with wood construction (they are low risk for cat. 5) and shingles, dubious of metal.  Of course that's a different environment.  Lots and lots of salt spray, and of course you have to assume that beachfront houses aren't permanent.

Even around here, salt spray environments seem to vary.  I suspect that Indian River County's wave-busting reefs make for less spray, more live oak hammocks.

I'm planning on an aluminum roof as our next roof. The companies I've talked to said we are too close to salt water for a steel roof and within 1km of saltwater you can only get aluminum. You also need to check the profile/joiners are rated for your wind zone. GulfCoast Supply has an aluminum roof with a 25 year 'OceanGuard' saltwater warranty, although I haven't seen what the warranty does for you.

Pull up to Watson's and look at the roof on the park structures, may think twice if you are considering metal.  Also used to be a yellow house on A1a 1-2 miles south of Paridise Bch Park, was all metal, it ruste3 away to the point they ripped off all metal (includihng roof) and re-doing it with stucco, shingles.  When it was metal they owners werer always painting repairing rust.

NOw if you are new building or could re-do you structure somehow a former co-worker had a cement roof engineereed, that was cool, not sure how he did it but it looked like it could go through a CAT 5 and needed no maint.