Multiple option deals
Giving several options to your buyer to choose from is generally a good idea, provided the number of options is not overwhelming. It makes people feel "in control" and leaves more satisfaction after the purchase.
Often several options come naturally with the deal. For example, the kind of haircut (man, woman, child), the color of iPad (black/white), the date of the event (out of the, say, five available dates), the size of a t-shirt (L, XL, XXL), and so on.
And with Getsocio recently added "Products" feature each deal can have one or many products.