Julie,
I learned from Pete Wright (Wrightslaw) that we should never refuse the test. To do so would mean we were afraid or something or hiding something.
The test should tell us how they learn best. If you don't agree with the test you can ask for an outside evaluation. We did do this with Cameron and they did pay for it.
It shouldn't matter what classification he comes up with. You want him in regular ed and he can be successful as he is now. The gap will widened as they get older. NCLB should help deal with that.
This is a short answer but call if you need a longer explanation.
Laurie