I am looking into buying quality Bitcoin miners in bulk.
Looking for some advice.
Thanks.
Hard to say what Quality is to you.
Right now there is the B6 Antminer S7, which oddly enough has 800gh less than a typicaly S7, while remaining the full price. It also ship late, so all in all, weird stuff here, but its an option.
https://www.bitmaintech.com/productDetail.htm?pid=00020151105082702881F8f0B9I405FFThen there is the Avalon6, which i don't personally know how much trouble it would be to setup, but also an option.
Lastly if you're looking at something more industrial, there is the SP50 which is coming out soon. If a big amount of hashrate in a data-center like setup is what you're looking for, the SP50 might be the best option.