Best Twin Turbo for 350z?

What do you think is the best twin turbo to get for a 2003 350z? I saw that Power Enterprise was putting 400hp to the rear wheels while Greddy wasnt keeping up. What is the best Twin Turbo kit I can get for my 350z?
Thanks.

greddy on stock setup is sick, but there is a problem with the car going into limp mode if boosted above 8.5lbs. i would wait and see whats gonna be done about this, IMO