Hi Johnny99 - and first off, is your handle from "The Boss?"
So then welcome to our little corner of the world. You have come to a good place with immeasurable help and knowledge from those that have "been there, done that" with respect to being told we have PCa, learning about
the beast, deciding on a treatment path and moving on.
You asked about
getting a 2nd biopsy, at this point I do not know why that would be necessary, however you would be prudent to get a 2nd read on your biopsy slides, as you have mentioned - but I would send them to a lab such as Bostwick and Epstein, two of the best at this as that is what they do and they are the acknowledged "experts."
Along with forums such as this where you can learn from people that have and are going through what you are, do as much internet research as you can. When I was at your point in my journey I encountered the "paralysis by analysis" syndrome as I was spending several hours a day doing all of the research and reading as much as I could - but that's o.k. as it will put you in a better place in terms of deciding your choice of treatment.
With your statistics as presented it would suggest to me (NOT a medical professional BTW!) that you are probably looking at a combination approach, the triple play of HDR brachytherapy, IMRT (external radiation) and HT (hormone therapy) that Michael_T suggested. Based on that approach I do not believe that surgery should be considered as IMHO why add the potential SE's from surgery when the 3X hit will do the job.
At my young age and excellent health, and with no symptoms or issues - while curing the cancer was / is my top priority, at the same time preserving my quality of life ran a very close 2nd. Be aware of this by doing your research and getting these statistics from the practitioners/treatment modalities you may be considering going with. You only get one shot at this - one of the most important decisions we're likely to make in our lives.
We are all out here to help - my very best wishes to you in this journey.
I'll end with Bruce's "Johnny 99":/www.youtube.com/watch?v=KuYUxsl_F7k