Two houses ago, I bought a 10x16 Ted's Shed. $3500 (10 years ago) and they delivered it, leveled it, and tied it down. Wood frame construction and metal (tin) walls and roofs. Pressure treated floor and floor joists. 8' wide roll-up door, 7' tall inside. Truly a Cadillac of sheds, but it withstood direct hurricane strike to West Palm Beach, FL where we lived at the time. Still there, going strong! If you can cough up the initial purchase, this is the way to go. It came pre-wired for electricity, although I never got around to running power out from the house.
At our last house, I built two of those tin buildings. One was 8x10 and the other was 10x12. Came in boxes from Lowes. $199 and $299, respectively. Both had sliding double doors. The small one had a simple sloped roof but the bigger one had much higher ceilings with the Barn-style roof line. Much nicer! Both withstood the 3 hurricanes of 2004 that hit Orlando. However, both tended to leak at the roof screws after time, and at the wall-to-floor joints. The roof leaks weren't bad, because they didn't drip, they just allowed water in that would run down the underside of the roof, down the walls and puddle on the floor. However, it was always very humid in those buildings, and I kept my dirt bikes and my sons' dirt bikes in them, they'd get mildew or moisture-induced corrosion. And, nothing water-sensitive (bags of cement or fertilizer) could be kept directly on the floor. However, it was great for lawn equipment, boat paraphernalia, lawn chemicals, patio furniture, etc. In the larger one, I built some light-duty rafters that allowed some lightweight storage (water skiis, fishing poles, etc).
The house we're in currently, I'm building a 12x20 shed using 'conventional' wood-frame construction and poured concrete floor and 8' garage door. We're just drawing up the plans now. Should be cheaper than the $3500 quoted for a smaller 10x16 Ted's Shed, and I'm hoping it'll be a fun building project for the boys and me.
Good luck with whatever you choose.
Kirk
