Hi, sorry to hear of your news.
I can only speak for myself as I had a similar diagnosis just over a year ago at about the same age.
First pray for Gods wisdom in this matter, then definately seek a second or third opinion.
I went with the surgery. Looking back I am glad because it is comforting to know that my removed prostate was on a pathologists examining table and studied to see just what I have going on. With the radiation I would always be wondering what is going on there (I tend to worry about things anyway).
As for the incontinentance, I am actually better off now than before, good solid stream and I am not always running to the bathroom as before surgery. ED is another issue that I am still working on.
I found a neat, simple book called "Prostate cancer for Dummys" real good information presented in a non freightening way.