As far as heads that are similar I would say the NAP Nitrons or the Wac'ems are just about the same as the Slicks. The one thing the Slicks have on the other heads is the blade thickness. I was checking out the Nitrons last night and they do look pretty mean, but the steep blade angle makes me a little nervous about deflection. I would say Wac'ems are going to be your best bet for a substitute. I am going to be shooting the Montec 125s.