Suggest PSU for bare minimum system

casual_gamer

In the zone
I want the cheapest quality psu for my system
AMD X2 250 3ghz
Asus m4a78lt m-le
2gb Transcend ram
Hitachi 500gb sata
Seagate 80gb ide
LG 22x dvd writer

I was using Mercury smps which came with the cabinet, one evening, computer switched off and my numeric ups was making long red beeps, i turned off and on the ups and then my pc, at the time my smps burst with noise and all my house lights went off. I've got the smps repaired by mercury ppl but i am scared to put it back. At present, i am using my brothers 3 year old Frontech 450w without any problem. is this enough or should i go for some psu like fsp saga 400w. Please suggest along with price.

My smps ratings:
Frontech : +5v-45A, +12v-19A, +3.3v-28A
Mercury : +5v-18A, +12v-25A, +3.3v-17A
 
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