Hi there! I managed to bought 12 cards Radeon Saphire nitro + 580 for 300$ each one about 4 months ago. Right in one week all the power cards were out of sale or rised their prices about 0,5 per cent pr even higher. What i want to advice to u. Now u will spend lots of money, but u will win if you have 2 mining farm with 6 cards each one. This power is now enough to make money and gather new farms. But if cannot such money, that is not a good idea.

you may read my last post to know which ones are going to be the best choice in July. https://steemit.com/bitcoin/@vikky/top-10-altcoins-going-into-july