Later model, larger wheels for my 02 A6?
 

I havent had my Audi long but will soon need tires and would like to put some better looking and larger diameter wheels on it. i would like to stick with an oem audi wheels maybe from a later model or different model. is there any restrictions that i should be aware of, size hole pattern? just trying to get some thoughts on what would look good and fit my A6. thanks