I used the standard treated stuff you buy at lowes, bought a bunch of deck books, but none fit my idea of what I wanted, so I got a custom.
8' x 16' plus stairs on either side, thing can withstand a hurricane, cost about $1100 does not include roof which I will do next year.
4x6x16 corners, four 4x4x8 posts, 2x6 decking, 2x6 steps doubled six feet wide. We like it.