Investing your 700$ is better for you either in Bitcoin or Ethereum, or try to invest in good ICO projects that can increase the amount of your investment several times (for example: BlockShipping).
Bitcoin and Ethereum is a good growing Cryptocurrency so we can buy now surely it will make good profit. But ICO is little hard to predict so many new investors are avoiding the ICO investment. Because it is more than enough to satisfy our requirements. so majority of the investors are continue the Bitcoin and altcoin investment.