My tires are at 29k miles and looking to replace. (2003 Z4 2.5 16" wheels) Suggestions?

Hi lazy dog. Without knowing the climate in your area and what kind of conditions you usually drive in (snow? highway? etc.), it's hard to make a recommendation. If you do a lot of highway driving you should be concerned about road noise for example. You should visit your local big box tire shop and put these details about your driving needs in front of them and get some insights into what type of tire is best for you. Armed with that information you can then shop for best price. Goos luck!