Milans: I had the same choices as you did. I chose a narrow margin, Radiation machine specifically with 2 mm margins to avoid over exposure to my healthy tissue. It had a built-in MRI so that what you could see is what you could treat with automatic shutoff and dynamic planning. Most of the other radiation treatments use 3 to 5 mm margins. I had five hypo fractional treatments. I had some urinary restriction, but that was taken care of by Flomax. I had no ED issue, pain issue, no catheter issue to deal with and was happy with my treatment. Like many, I was happy with my choice and would do it over again if I had a biological reoccurrence. I consulted with five radiation oncologists, one urologist and spent a good deal of time on this web site, before I made my decision. I also had spaceoar inserted.