I am curious, if you had 500$, what portofolio would you build right now? How many coins would you buy and how much money would you put in each one of them?
So, what portofolio would you build with 500$?
It all depends on how much risk you want to take.
If you want to be safe go for:
200$ BTC
100$ Monero
100$ Ethereum
100$ Raiden Network
Else if you want to go the risky way go allin in ETH and invest in a couple of different ICOs but you have to do tons of research first.