Long time lurker here; new poster.

DS(6.5) is getting to the age where we would like to test him. We suspect he will be at least HG-plus. I have read (I think on this forum) that the new WISC is coming out this fall and that there is significant difference between scores of those who test when the test is new verses at the end of its test-life. The question is-- when should we test? If we do it now, his scores will be inflated? But if we wait a few months the scores will be deflated. I don't want to wait years just to get a "more accurate" score. Why do the scores fluctuate? Is it only because the answers/test format leak out over time? I'd like (and honestly easily expect him to) qualify for Davidson, but I am nervous about the timing of the new test.

Also we are planning on testing at local university (we are NOT in Montana now). Will this be a good place to do it? We can't spend thousands right now to test. I'd like to keep it under 500$. I've been told we may get a worse score if they don't have experience with gifted kids. We are in the mountain west but can not afford the Denver gifted center testing. Advice?