oversized injectors

[Iron 1]

in this link it shows that injectors from 600-1200 cc/min are the same price as the 1600. would it be better to get the 1600cc, or just stick with some 860's? if not the 1600's how about something a little bigger just for insurance?
rc injectors

 

[NoJokE]

How much power you plan on making? 1600 is huge, i am gonna be getting 1200cc injectors for my setup, and i plan on making 500+WHP.