3 years would be the absolute longest i would expect that unit to last, it probably wont make it more than a year and a half, you never want to run a power supply until it dies because its method of death can kill other things, i really wouldnt buy any lower wattage HEC units or anything that still has a voltage selector switch on the back.
If the HEC and huntkey are the only options you have, im sorry but you are screwed and its time to switch to a new store, huntkey units are notorious for being explosion prone, and HEC units are cheap crap, its time to find another store, there are some that will ship anywhere in the world.