What size tires and wheels are best for stock suspension.

This is my first post on here. I have a 2002 325ci and looking through all these threads and all the different tires and wheels I am going nuts. All I really want is either an 18 or 19 inch wheel with the correct tires that would be a good fit for my car with the stock sport suspension. I really don't want to lower the car, nor do I want to roll the fenders or anything. What can you guys recommend for size and what not that will give me the best look and function without looking like I have a ton of wheel gap. Thanks in advance.