Here's something else to think about. There are many makes of aftermarket alloy wheels each offering a variety of models. There seems to be a significant “churn” of patterns. I found when changing wheels (http://www.fordowner...eel +transplant) that even some recently announced designs had already been superseded.
Now just suppose that in a year or two you have the misfortune to damage a wheel beyond repair. If it's a standard Fiesta wheel there's no problem. Thousands of wheels are out there in breakers' yards, eBay and of course available from Ford dealers. If it's an aftermarket wheel I reckon there's a risk that your supplier will find that your particular pattern has been discontinued and you'll be faced with buying a whole new set.