buying 2 x ant miner s3 would be cheaper and can be overclocked safely to 504gh/s each to a total of approx 800w. and cheaper than dragons also.
this is his correct choice. buy the 2 s-3's and buy a good psu like
this one
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=evga+1300&N=-1&isNodeId=1he spends 1.45 btc for the miners that is 1.45 x 630 usd = 913.5 usd the psu is 170 after rebate an ethernet switch is 25- 30 usd
http://www.newegg.com/Product/Product.aspx?Item=N82E16833704043http://www.newegg.com/Product/Product.aspx?Item=N82E16833704173 a few ethernet cables
3 usd
http://www.newegg.com/Product/Product.aspx?Item=N82E16812422117&ignorebbr=1total
913.50
170.00
30.00
3.00
1116.50
they run 930 gh and 732 watts without overclock
If he runs in texas power is about 10 cents a kwatt.
He should be able to run it without much fuss.
way cheaper then a Dragon Miner.
and even if all the BTC goes to shit and becomes worth less. He will still have a quality PSU