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.
I had a psu start to smell like that when I put the 3rd card on it.... so I left it running to see how long it lasted. Well let's just say in a few hours I was getting my RMA #.