I really like the look of four coats of megs #16 on my white taurus. The problem is that they stopped making it a few months ago. If you really want to make it look great polish it till it's glassy, put a few coats of UPP on it, spend a while with some VRT (or other rubber dressing) rubbing it in to the rubber trim, letting it dry, buffing it off, and repeating. Once you've done that then you use your favorite glass cleaner on the windows, being sure to not get any overspray on the newly dressed trim, follow up with more UPP on the windows.
The real trick to white is not the paint, it's everything else. The trim should be a deep black, the tires should also be deep black, the windows should be clear, any chrome should be shiny. White is about contrast.
Good luck.