Yours is a very interesting post and I think provides a real insight into the "whys" of treatment choice. One of the benefits of this forum is the opportunity to exchange views on things like this.
Just to show you how people are different, I had very few of these needs to "get it out", see the pathology report or even worries about "cancer within". For me, the peace of mind came with thorough investigation of options and making an informed decision that had a high probability of cure, i.e. as the literature points out, surgery and brachtherapy have essentially equal cure rates. I clearly recognize the trade offs, embrace them and am confident in my decision...just as I'm sure you are with yours and realziggy is by enrolling in a clinical trial (which would have been too much uncertainty for me!). Maybe one of these days some smart doc will do a psychological profile of patients who make different treatment choices...
In the short run then, for me, it's a no brainer. I'm one week post procedure, have zero sides, have resumed all of my normal activities - except for sex, which will start again next Tuesday since the docs asked junior to take two weeks off post-procedure. Yeah, I know there may be issues down the road but I have the peace of mind to deal with them as you do with your surgery issues.
Dramatically different but interesting perspectives, yes?