Dash and Monero are good coins, but in my opinion it would be nice to try on top 10 CMC coins, which don't have to wait long to hold those coins
For little investments like that of the OP, investing in top 10 coins on coinmarketcap will not bring noticeable profit, he might lose he's investments but he will not make any profit either, It is better to invest in lower ranked coins with little investments.