I don't have any experiences with the Quasar Pro, but one of my friend has one and sometimes all this things happens. like the fans turn off automatically, display becomes black, false peaking, unstable current [wasn't the power supply's fault]
I also read about this stuff in some forums.
I think the best charger around $180-$200 would be either the CDC 6.0 or the LRP pulsar.
I'm using a CE pitbull and no problems here...