Make sure it is a good PSU. A quality modern PSU has full range active PFC (no little voltage switch; works on ~100V-240V) and some level of 80+ certification for efficiency. Seasonic, Antec, Corsair, XFX, and Enermax/LEPA are among the better brands. I am not sure what is available to you; FSP, OCZ, Silverstone, and NZXT have some models that qualify, but others do not. PC Power & Cooling is also mostly good. Avoid Logisys, Diablotek, Apevia and Crappermaster (Coolermaster). Most Huntkey are also bad, but a few have received favorable competent technical reviews.