Vespas are fairly simple machines and parts are readliy available. If it is the Deluxe with the variator, it's the one to have. They can take any hill with ease.
To spot the variator, remove the left side cover that hides the belt. If there is a large metal drum looking thing at the back wheel where the belt goes to from the engine, it is the one. A regular single speed Ciao has a common looking pulley there.
The mileage can never be verified, but an overall inspection of the bike can yeild clues to the fact that the miles truly are low. Look underneath the engine. If it has greasy deposits there, don't believe the mileage.
The tires should still have the "stipes" from the molds, since these are practically new tires. These are the whiskers you see on new tires. The pedals should show no wear.
Go to vespasupershop.com and look at the moped section for a description of the different models. For parts this is the place to go. They have it all.