Best roof in Hurricane area

After Hurricanes Wilma and Irma damaging our asphalt shingle roof in the Florida Keys, we are looking to install a metal roof, but know nothing about them and would like to know what you think and if we should get improved specifics. A local contractor gave us a quote: " to remove the existing roof,and refasten the deck, and cover with a peel and stick secondary waterproof underlayment, and install 26 ga Galvalume 5 v Crimp metal roofing (no field seams, single pc panels). All fasteners installed on TRC 5v roofs are stainless steel capped fasteners. All flask=hings are premium factory fabricated flashings, premium gable closures, hip and ridge metal hand notched to insured Highest wind resistance. All gables and eaves set in a bed of butyl tape." 7 year contractor guarantee against leakage. The price is $9000 for a roof of approx 48 x 30 ft. Any questions that I should ask or changes to request, such as gauge or screws rather than nails, etc. ANy advice would be greatly appreciated. Thank you, Rick