I don't have experience with the wppsi, but just from reading other posts here, it seems there are ceiling issues with WPPSI in gifted kiddos. I'd go for the SB-V if I were you. My DS took that at age 4, and he also wasn't too mathy (compared to other kids on this board). It was nice because it has no timed components. Any others with experience with more of a variety of tests want to pipe in?