i am very biased and will say greddy. i haven't had any probs with my kit, and if the new kit has a better turbo, then i think that should be your choice.
i don't think the max hp makes too much of a difference unless you're going to build your engine and run much higher boost.

sleeper: have you seen any numbers for the 19t kit and what it can put down at about 10psi?