Automotive wraps

Next week I'm buying a couple of Smart cars for use by my staff. I want them wrapped to visually promote the business. Presentation quality is important; they are a public "face" for the business. I want something that will present to a similar standard to the factory paint. Is that possible? What should I be looking for when dealing with suppliers. I'm OK dealing with the graphic design, its quality of materials and workmanship that I'm concerned about. I'll probably keep the Smart's for 3 years.

I'd really value comments or advice if you have experience as a customer or supplier.