[quote=ultramarina]
2) Put him in DD's school and hope for the best when testing rolls around in K;
This is my suggestion, because I think the cost of going through the lottery and maybe not making it in is too large. Especially when adding to the very real cost of wear and tear on you of having 2 kids at different schools when you aren't delighted with each school choice.
I checked WISC IV can't be used until age 6. I'd wait for that unless you have a local tester that is good with SB or DAS. Call the school and find out exactly what test IS being used an if it's a 'full' version or some shorter version.
WPPSI is the Weschler test for 5 year olds, and it have very little headroom for gifted kids, which your son sure sounds like. The less headroom the more likely the test is to under-report the full extent of a child's giftedness. Parent's who have kids who have taking WPPSI say that they are floored at how much it doesn't test, such a reading ability. Think about it - how are you going to find enough reading 4 year olds to get norms on reading questions?
Hope that helps,
Grinity