OR.... Middle of the road and get 14 or 15" wheels which are cheaper and easier to come by!!! I'd say a greater percentage of us have 14-15" wheels on our cars. There a few with 16"+ on thier cars and quite a few with the factory or 13 inchers on there still. It's all really dependant on personal preference and what you can afford.
Also** Refer to the Tires/Wheels Known to fit Sticky up at the top of this Forum to help you out.
not to mention from what I've read on here from the guys some 16's can be tight, 17's are pushing it and 18's are probably out of the question. I still have my little 13" slots, but putting away some extra$ here and there for some 15's