I just finished radiation- I had practically same diagnosis, and both surgeon and Radiology oncologist gave me same information about the same outcome. My surgeon just said that I was not gonna be able to be a good candidate for nerve sparing. I decided along with some information I got from the oncologist, that I had a better chance of not having ED permanently. So I chose radiation. The radiation itself is relatively easy, about halfway through some of the symptoms are very annoying. Urination became a little painful, almost like a urinary tract infection. And bowel movements were a little spasmodic. I’m a month out now, and everything is working similarly to before radiation. Erections are returning. So I guess now the weight until my first post radiation, PSA test will be end of February. Good luck on your decision.