KRM,
You describe my life at age 56 - good health - my job involved 200+ days of international travel per year to all parts of the globe. I would leave for Norway with a pack of meds that included malaria pills because no set of tickets was even used as planned. That part ended with my DaVinci surgery. In my situation, I had to travel on short notice, and stand for hours in front of groups of businessmen and students. The persistent incontinence I suffered for the first 5 months left me effectively unable to travel, much less drive more than 100 miles, and certainly unable to present a vibrant and active image for my company. Then along came RT (IGRT with Calypso markers), which added all the known common side effects, but those were more due to a lifetime of colo-rectal issues.
I have not been on an airplane in almost two years - I'll be flying up to our GFMPH weekend - first flight since surgery. I pity the flight attendants.
I still work, but I don't get to do the things that gave me enjoyment in my job.
There is no way that I can even speculate your results, but mine hit and exceeded every negative point they said might happen, "but 98% do fine". OK, 98% of the guys out there did better than me. Bravo for them, and I am really happy for their progress.
So, if I had not done adjuvant RT, I would likely have regained my continence, and been able to travel again about 7 months out from surgery. However. my rising PSA proves that there was justification for it.
If I had done only RT as a primary treatment, I would have some issues, but most would associate to prior damage from other cancer and surgeries. Most of the men I met during my RT were much older, and most did great (I asked the wives who were there waiting - we all know men will never admit having issues). Much better than I did. The problem there was that I am very advanced, and primary RT was not really a valid option (9 of 12 cores positive, mostly G 4+4, post-op G4+5). For you, it seems to be completely valid. Seeds also seem a very valid option.
So, why / why not surgery? Consider the side effects and the benefits. Likewise RT. Make a list. Read Walsh's and Scardino's books. Don't make my error of discounting the side effects. I should say I do not regret my decision, as I think it was proven correct medically, but I underestimated the possibility of NOT being in the 98%.
Each of us has to decide, and the doctors are of little help. Then we move ahead.