Before you spend any money, be aware that ETH may change from proof of work to proof of stake. Here is a link, but I suggest you do some more research. https://ethereum.stackexchange.com/questions/102/how-does-the-casper-proof-of-stake-algorithm-workDefinitely need to build a ETH rig, if anyone knows where I can get some RX470s or RX480s that are in stock let me know.