Do you plan on going much further with the power upgrade?
If you plan on going much further, grab some larger injectors. I have run 550s within standard FPR - but consider that most
After market injectors are rated based on a 3kg base fuel pressure, the factory FPR is rated at 2.55 kg
So 'best' option would be to get some larger injectors and a FPR - as mentioned earlier, Nismo bolt on type is a good option, minimal stuffing around and work well with the factory fuel rail.
For a budget upgrade to give a little extra injector headroom - a FPR by itself can do the job well - once again, Nismo type is neat, easy to fit and works well.
Not a fan of rising rate FPR, as you end up with higher pressure than the injectors are rated at
My 0.02c