I would stay away from SB-IV, no reason to take an outdated test. The recommendation is usually to stay away from WPPSI for gifted kids at the age of 5 due to ceilings issues and wait till they are 6 and able to take WISC-IV or to take SB-V.
That said we did WPPSI at 5:3 and it went great. Yeah, he hit ceilings but he still got great numbers. We were told that his VIQ wasn't accurate, but that was because he is bilingual. We were told to retest him at the age of 7 if want more accurate verbal score.
If DYS is one of your goals, keep in mind that the criteria for WPPSI is 150. 5 points is quite a lot. I am not sure if a score of 150 for 5 year old would be 145 for 6 year old on WISC-IV (I doubt it). I can see why they increased the requirement. If a child is tested at the age of 3 and cooperates, he/she will have a huge advantage and get higher score just thanks to the fact that lots of 3 year olds in the testing sample didn't cooperate, couldn't concentrate for too long or simply didn't care. I think this advantage decreases with the age. 5 year olds are more likely to cooperate than 3 year olds (don't tell me that's not the case, since I have high hopes that one day DS3 will be much more agreeable than he currently is).
DS5 also took WJ-III. Word of warning about that, you may have problems to get some of the composite scores at the age of 5 and especially if your child is not in K yet. They just don't have samples for it, so I would double check with the psychologist and see what exactly you will get out of it. DS5 was tested at 5:3, he was already in K and he still didn't get one of the subtests (written test, I think) and didn't get one of the composite scores and therefore the total achievement score.
Crics's son took WJ-III at 5:1 (I think), but wasn't in K yet and he missed even more scores than my son did. They both became DYS with the scores they had, but it may be something to consider.
BTW Dottie, do you remember the discrepancy between DS subtest reading scores and the composite? I think the subtests scores were by his age and the composite by grade.
All that said I am extremely thankful that we did have him tested at that time. It was a real eye opener and one of the best things we have done as far as him being gt. I think we will have DS3 tested at similar age.
Good luck
