I would keep the watt meter
they are useful for all kinds of things.
Funny thing is my I7 2600K @ 4.4 with a 5870 idles at about 80 or so watts and games under 300watts.
Its not about wattage as much as quality of the power(many cheaper units have too much ripple or voltage that falls out of spec) and how much of it is on the 12 volt rail.
I am not lying when I say that the 300 watt FSP I showed above runs a 650ti without ANY issues(under 150 watts[as per my APC ups] on most games, but I am almost sure I can hit close to 200 with OCCT psu test), but it is a very power efficient system as well.
I do not think the cpu ever hits full load, so again it can take more.
It is hard to yes or no a power supply that I have never tested.