Fueling & Injection - fuel rails

At what point should I consider changing my fuel rails? I am going with a heads cam and 100-150 shot sometime later this year. Basically I am looking for 550-600 rwhp. I have injectors already, and will upgrade the fuel pump to a racetronix intank most likely.

600rwhp is fine with the stock rails. LPE has gone 750 rwhp with the stock rails.

ok cool. less money that I will have to spend just yet.