Ive got the Aluminess tire carrier, it's expensive, well built, and it allows me to have two spares. I've wrecked several tires, and once you put the spare on, should you get another flat, your pretty much out of luck. Every flat I've had has been well off the grid.
Oh, and Boywonder there is a uhaul hitch mounted under there. Looks like that will have to be removed or relocated. Don't use it anyway.. just liked it as a tow/pull point.