enermax and corsair are way too expensive to justify. I am totally for getting a solid psu for your mining rig, but those are borderline ripoff.
I use the coolermaster silent pro certified that's half the cost and never had any problems with them.
i have a computer w\ a 600w coolermaster and if i hook up more than 1 gpu, it starts smelling like burning.
coolermaster has many different lines of psu some are pertty cheap. but i like their silent pro gold/bronze certified models, seems to be high quality and half the cost of corsair/enermax. Most review tests confirmed the voltages are stable under max load. Good enough for me...