I recently posted some "active surveillance" guidelines from Johns Hopkins on another thread and, yeah, per those guidelines anyway, they would not have recommended that approach for you.
As you are considering brachytherapy, you can see from my signature that was my choice. You can click the link to see my journey, which probably includes more than you would want to hear! In any case, there are plenty of folks here that can provide you with surgery advice, a few with HIFU and I would be happy to provide any help I can on seeding.
Hopefully you are talking with surgeons (robotic and open), as well as a radiation oncologist and prostate oncologist to learn everything you can so you can make an informed decision. I also had a telephone consult with the docs in Jacksonville re proton beam therapy and did a fair amount of research on HIFU. At one point I narrowed it down to robotic surgery and brachytherapy and had appointments for both procedures...finally cancelling the surgery and going with brachy.
Good luck in your decision and I'm glad you are taking the time to do your research. Believe me, once you make a choice you will find some relief..
Please let us know what you choose and how you're doing.