Actually, the Antec Earthwatts series of PSUs are pretty good. Not Corsair/OCZ/PCP&P good, but good enough. Assuming you already have the case/psu, I would just use it but keep in mind it's limitations with future upgrades. BTW, it is not just the wattage that is a concern, but the amperage as well.
Again, if you have already purchased the case/psu combo, run with it. It will run just fine with the components you have listed.
Just be cautious will additions/upgrades down the road.