Boy, does this sound familiar to us. Our daughter was also granted a seat in the local HG charter school. We were so torn because there's a private school almost next door where she has friends. It's expensive, but after talking with her new teacher at the private school, we ended up settling there. It turns out the teacher at the private school is certified in gifted education and actually taught four years at the HG charter school anyway. We are hoping that our seat will be available next year (just in case the private school doesn't work out).
My wife and I have been looking into buying something in PDX. Are you referring to PDX's "ACCESS" program?