TAnn,
I'm so sorry you had to join the little brain mets group (talk about a club no one wants to join ), but want to give you some hope too. I have posted a lot about Steve's brain mets (you can check some of my old posts). I would try to get a second opinion from a neurosurgeon at a Specialized Gamma Knife surgery center before making your decision.
We definitely did not want WBR. The chief G.K. surgeon at USF did feel that WBR had to be done first, but Karen seems to be doing fine without it. Our neurosurgeon in Sacramento felt that you could do G.K. first and then only do WBR if necessary later, but should not do WBR prophylactically. Ultimately we were forced to do the WBR and, while it wasn't a "piece of cake" for Steve, he did get through it and seems to be doing well now. I also know someone who is 4 years out after WBR who is back to work and sees no major problems other than some short-term memory stuff.
I'll be thinking of you and praying that all goes well with whatever path you follow.