Let me tell you that you are planning to invest in top 10 altcoins and you have left one out of them which is Dash. Even dash is a good one to invest for long-term and trading for short term.Next coming to the main question about the Monero, and if you believe me technical wise Monero right now is standing on Good demand zone where you can start buying in small quantity and once it confirms the uptrend by breaking the 380-400 price barrier again then you can add some more quantity to it. By this way, you reduce your risk also and you are averaging your cost of buying too, which is really a good trading approach and it is highly profitable for the Long run.