My wife has a pair of black Sidi Vertebrae 2, same as me. Very nice boot, comfortable enough to walk around in, doesn't look flashy and is build pretty good. You should be able to find a pair for a little under $200.
My Wife is not a heavy rider yet. She is jsut about to take the MSF Course. I'm looking for something around $100. They don't have to be some High speed, Super duper, Back flip type of boot, just something that will keep her safe.