You could consider putting that $500 into something that not only appreciates in value itself but also something that can earn you additional revenue that can then be used to expand your portfolio further. That includes projects like COSS, PPT, SPECTRE, PPP. All of these prices are relatively low in relation to the upside potential in 2018 beyond.

COSS holders already get a % of fees from the platform in various tokens.
The other three options above whould have their platforms up and running within the coming months.