While SL does have some strong scents, this isn't the best brand to look at for blasting, obnoxious, room-clearing projection -- they tend to be more tasteful than that. Chergui is far from the best that they offer, but for some reason, it's the one that people seem to cite the most (most accessible perhaps?). I'd take a look at something like Sarrasins for a better idea of what the brand can really do.
If you're just looking for something where the volume's screamingly loud, why not look at a different brand such as Bond or Mugler in which volume is one of the primary goals? Keep in mind that projection doesn't equal quality (Jupe! should tell you this and should even suggest that it often signifies the polar opposite) and many excellent perfumes aren't really designed to choke out bystanders. In fact, some of the greatest contemporary perfumes currently available are quite ephemeral (as part of the aesthetic).
But from the SL line, if you're willing to bypass volume / longevity for the actual scent itself, I personally find that Sarrasins, Serge Noire, Encens et Lavande, El Attarine, De Profundis, and Boxeuses are the real standouts.