I have been shaving with a Gillette NEW and a shimmed Gillette Tech for 2 years. I sport a beard. I think I would like to try a Schick injector as its small head is appealing to me. I realize that there were quite a few models and their shave characteristics vary. Could someone please give me a rundown of the most available models and there levels of aggression? I am also interested in buying blades in bulk. I would be interested in my blade options. Thanks in advance.