you should fine with that psu....i did a rough calculation on power supply wattage needed for your rig..., and with the current configuration of your rig, you should get around 350 watt psu...350 should give you a bit of extrra power...but i would get something like you are looking at 500watts. and give you future proof upgrades too...
the antec earthwatts 500 is a great choice
here is another that looks great too-http://www.newegg.com/Product/Product.aspx?Item=N82E16817151094
seasonic also makes psu,s for numerous manufacturers , like corsair, etc