Look you start the topic and tell you have budget 600-800$ I tell you with this budget the best is to buy bitcoins..
Now you are looking for s4 this is up to your budget... Anyway you can setup it following this tutorial http://eastshoretrade.blogspot.gr/2014/10/tutorial-setting-upbtc-miner-antminer.html?m=1
Now you are looking for s4 this is up to your budget... Anyway you can setup it following this tutorial http://eastshoretrade.blogspot.gr/2014/10/tutorial-setting-upbtc-miner-antminer.html?m=1
I can manage my budget if i can earn from that hardware .. making good money every month