Hi everyone,

I am building a 6GPUx10rigs for mining ethereum or zcash

mb: Asrock H81 BTC
cpu: Intel i3
ram: 8G

GPU: I am thinking to use SAPPHIRE RX470 8g (samsung memory) 470 price per MH/s is lower than 480

PSU: Enermax EMR1600EGT Enermax MAXREVO 1600W or LEPA G Series G1600-MA 1600W (copy of enermax)
http://www.lepatek.com/eng/product_content/1/1/20/
http://www.newegg.com/Product/Product.aspx?Item=N82E16817494006

Which brand of GPU is better to use? MSI? SAPHIRE? XFX? POWERCOLOR?

The psu's are cheap, about 200 EUR. I am using 2 of these on my 2 rigs (6x380 and 6x470) for two months. They seem working fine.
a lot of miners are using corsair ax1200i. is it so good?