For future references, include the name of your CPU (ex: i5-4460). A 500W would be more than enough for your current build and leaves you room to upgrade
The first thing to know about power supply wattage is that watts mean nothing when it comes to power supplies.
I don't know what you mean, are you talking about quality > wattage? If so, I agree, but I wasn't telling him to go out and buy a bad power-supply. He/she was asking on what a sufficient wattage would be for the current setup.