At one time or another, I have tried just about everthing to shave my head -- DE, straight, Headblade, GEM and Injector razor. I prefer the Headblade. However, since you are wanting to avoid cartridges I would recommend a razor with a longer handle -- 38C (Merkur long-handled HD) or a Schick Injector. I would recommend a Schick J model or N model as possible options for an injector.