Does your car have "clear coat" paint? If it does, car wax is the last thing that you should be using on it!! Did you know that on a hot summer day, that car wax (especially the ones with carnuba wax) can liquify and evaporate? There goes your protection!
I use a polymer sealant instead of wax, my brand of choice is DuraShine because the water doesn't bead up and spot my paint, it just kinda runs off completely. And you only have to apply it like 2-4 times a year, depending on how often you wash your car.
Also, the polymer sealants resist dirt better than wax.
Raindance, TurtleWax, etc all make poly sealers for clearcoat paint, just read the labels to find the right one.
PS - RainX your windows! I live really close to the great white north, and we get our fair share of snow, frost, sleet, etc. With RainX you can scrape the frost from your windows with a rubber squeegee. The other nice thing is not having to use your wipers on the highway in the rain, the water runs off faster than the wipers can remove it. It also helps keep your side and back windows clearer in rainy weather.