Hard to say. The Mac Blick kit would give you the rare factor as I don't recall it on any "public" car. I like the L-Sportline because it is full replacement but since it was readily available for a few years, it is more common place. I like the Wald Exec too. For a lip kit, it is pretty nice and it is somewhat rare.
Personally, given the three, I'd go for the L-Sportline because I think full replacement kit has cleaner lines. You can always mold in the lip kits but I'd rather just get a full bumper. If you don't have this hang up, then the Wald would be a nice option.