My 6 year old got on the RIAS 147 verbal, > 160 non-verbal, and >160 total (the psychologist said he hit the ceiling). I sent these scores to MENSA, and they accepted them. He had gotten a 99.1% on the Raven's, which our local gifted program accepted. They don't accept the RIAS, apparently.
I don't want to spend $ either on testing since there isn't anything more that we want to do with the scores. I don't know why he wasn't given the WISC but it doesn't seem to matter. He reads at a second grade level and does his brother's third grade math; we aren't looking to skip him so...
I guess it really matters what you might need scores for and why.