Of course 200 dollars is ok. You can always invest some more..
Trade smart and by the end of the next month you can earn double or even more, good luck!
Yes $200 is fine if someone will do it on a monthly basis and just to make it sure that you should buy it with bitcoin or if not you can try some other alt coins to expand your crypto investment. There are other coins to invest too but if you'll stick to bitcoin it's up to you.
Invest in Top 3 most promising Coins in 2018:
1- Verify (CRED)
2- FLIXXO
3- ELIXIR (ELIX)
Top 3 most promising coins of 2018? I don't think so.