If electricity in your country turns off too often then YES, if they never turn off, then NO.
I have GS-700 PSU and it runs great when my wall socket gives voltage lower than 220v (Yeah! I have 220v output from wall socket) sometimes it goes below 200v and my PC runs perfectly, My PSU can run from 90v till 260v so if your wall socket gives you good output then it's ok to use PC without "AVR".