These coins are good options. But if you only have $500, I suggest you buy Tron and Stellar. Tron price is about $0,095 and Stellar price is about $0,32. The prices of these two coins are still cheap enough, it can make a higher chance to gain bigger profits than buying EOS or Ripple. The increases of Tron and Stellar are also good enough, the most important thing is that they have no bad issues. It will be safer to buy a coin with have no bad issues to avoid a too high risk in holding it.