Slayers Premium is the best of the movies IMO. The movies and specials with just Naga and Lina are not as fun, but with the whole main cast it makes for a funny movie and Naga even got a cameo. My favorite series for their plot are still Next and Try. My favorite art style is from Revolution and Evolution-R. I guess that's it, I've seen all the Slayers series, movies, OVAs and specials... I wish they would make more!