I have 13 straights and 2 DEs. The DEs are both the same, one for the house and one for the travel kit, and I used them before I switched to straights. Most of my straights are either different widths, grinds, or tips, as I bought a variety over time to see what worked best for me. I pretty much use just one straight now, but will take one of the others for a spin now and again if I want to mix things up. The only thing I really rotate are soaps/creams and their complementary balms/splashes, as I don't like to use the same scent every day. But even so, I don't have enough to use a different scent each day of the week; I have about 5 combinations to choose from.