Do yourself a favor and buy a good power supply it will cost you a bit more but if you get the rebate your fine. The PSU is like the heart of a PC.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
Do yourself a favor and buy a good power supply it will cost you a bit more but if you get the rebate your fine. The PSU is like the heart of a PC.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
Look, if the XFX 550W is too expensive for you then this is the minimum PSU I'd put in my PC and is a MUCH better component than anything by Raidmax. After rebates it's an absolute bargain at $19.99 http://pcpartpicker.com/part/evga-power-supply-100b10600kr