For a long time I was a fan of the Personna M5 Magnum. I can't recall ever cutting myself with that razor, it was really a smooth shave. It was available cheap at WallyWorld and the carts lasted pretty well before I felt the need to change to a new one.
Suddenly Wally decided not to carry the M5 anymore and they started slinging Harry's razors. I kept looking at them but the day came that my last M5 cart bit the dust and I broke down and bought a Harry's razor. That proved to be a sound decision as Harry's makes, in my opinion, the second smoothest razor for head shaving that it has been my privilege to experience. It's a 5 blade system and so far I've had good results with it.