I'm hoping that this post doesn't go awry of the rules. If it does, I apologize in advance.

I'm looking to purchase a table saw and I am trying to choose between the Bosch 4000-09 and the 4100-09. the only difference I can figure out is that the new one has a slightly more powerful motor, and a new blade guard system. Has anyone used the new one? I found the older model at a large discount so it will run be about half the price of the newer model. Unless the new "safety" features are vastly superior I can't imagine spending the money on the newer model. Anyone have advice on this?

Secondly, in the past I have used a radial arm saw and circular saws to do all my cuts. I would like a good book on table saw safety and technique. Can anyone suggest one?