Scott, I would say that with those results, you probably are on the treat sooner instead of later path. As far as treatment choice goes...and why talk to all these different specialists...well, you've already encountered one of the classics:
A Urologist tells you that surgery is the way to go because you can't do salvage surgery after radiation. Well, consider this: A Urologist, by definition, is a surgeon. So, they recommend surgery. If you were interested in a Honda automobile, would you ask a Subaru dealer what he thought? Also, the second part is true--to a point. The message is, "you have no salvage choices if you do radiation first". Which is not true. The subtext also is, "If you do radiation, you WILL need salvage treatment", which is also far from the truth.
The fact is, with your numbers, cure is in your vocabulary, and cure with primary treatment of pretty much any of the standard modes (surgery, Brachytherapy (either LD or HD), SBRT, or External beam.) The choice is yours. What can you manage schedule wise, what side effect profiles work for you, what is available to you where you live?
Why worry about
the possibility of needing salvage, when you've got a 90%+ chance of cure with primary treatment?
Age at Diagnosis: 56
RALP on 2/17/15, BJC St. Louis, Dr. Figenshau
58.5g, G3+4, 20%, 4 quadrants involved
PSA 3/10/15: 0.10
My Story: www.healingwell.com/community/default.aspx?f=35&m=3300024