surgery decisions I need help

I have come to this site often and I love it.Now I need to make a decision about my surgery and would like any input I can get.I have IDC grade 3 multifocal er-/pr- her2+++.I finished with chemo 4 weeks ago 4 A/C 3 carbo-taxol-herceptin.I though I had decided to have a Bi lateral mastectomy and now I'm not sure.My surgeon says I have a greater risk of a recurrance than a risk of a second primary on the other side. Now I'm confused. I know it is my decision and my sx is next Friday 10/7. I have to let him know on Monday so they can schedule for enough time. Thank you in advance for your input.
Alice