Dear Susan,
My opinion: if you have 7 mets, I would consider the cancer in the brain systemic. The only treatment for that is WBR.
I would look into getting into the allos trial
http://www.allos.com/ because the response rate is something like 50% higher. As well, the biggest side effect concern from WBR is collateral damage to the rest of the brain. There are a lot of research results indicating that taking a drug such as arecept or memantine will compensate for that.
I would not take any chances with that number of mets and go for the WBR.
Good luck,
Al