In reply to Marq:
If you google your car make and a model and the letters 'PCD' you will find the bolt spacing of your wheels, then technically any wheel with this bolt spacing will fit, opening up your options to more than just factory wheels from your model of car.
As long as you keep the wheel width and offset close to your current setup (width within a inch and offset +-10mm ish) you should not have any trouble with fitment, and you can also play tunes with the tyre size (or slip on spacers) to make sure you don't either stick out of the arches or rub on the suspension arm if you find a set of wheels you particularly want that don't quite match your current wheel dimensions.
Be careful of 'too good to be true' cheap new wheels on ebay and such, they are often very poor quality and will likely buckle or even break with prolonged use, especially on larger cars. Be careful also of replica OEM wheels which are often poor quality imitations.
Some cheap-ish brands that have proprietary designs and are actually decent quality; Rota, XXR, JR wheels.