First PSU: OCZ 600w StealthXstream ( OCZ600SXS )
When RMAd they gave me
OCZ 700w StealthXstream ( OCZ700SXS ).
It's currently under going RMA.
I live in Oklahoma, in a 12 Unit Apartment Building. There's 6 on one side, and 6 on other side of building. I'm in bottom middle.
Don't really know how to tell how the power is, I just don't want to lose another PSU. The PSU, both times, made a very loud popping sound.
The original Stealth's have a reputation for doing what you've described.
I would ask for a StealthXtreme2 600W which apparently is much better and the improved version.