You might also consider a nice electric wet/dry shaver. I personally use the norelco cool skin shaver, and it has not nicked or cut me since I bought it around thanksgiving. It's expensive(95 bucks) but it should last me at least a few years.
It gets just as close as a blade would, or at least close enough. There are other wet/dry shavers for half that price btw that i'm sure also do a good job.
Also, I recommend shaving while taking the shower. With the warm water running over your head. Why? Because it makes the hair ridiculously easy to cut. I've done it after holding a towel on my head for a few minutes as well, without the benefit of running water on my head as I shave it, and it takes more effort and time to cut it that way.