If you didn't purchase the power supply yet, i'd suggest a 650w or higher. This recommendation is only to allow for additional overhead for future graphics card upgrades. For your existing build the 550w will be adequate.
While it is enough, if you wanted to overclock the cpu and gpu and maybe put in a custom loop to cool it you'd be better sorted with a 650w what psu are you looking at?
If you didn't purchase the power supply yet, i'd suggest a 650w or higher. This recommendation is only to allow for additional overhead for future graphics card upgrades. For your existing build the 550w will be adequate.