As i have always said, never buy into a coin because it is very cheap and believing it will skyrocket by 100% percent the next day. That will be an uneducated assumption. The main reason you should by into a coin is because of its health. It must be the first consideration.
I will rather buy a coin that is very very expensive and healthy than buy a very cheap coin that is unhealthy. Why you may ask? If you buy into an unhealthy coin you stand a very high chance of your coin getting stuck for a very long time thereby preventing you from engaging in more lucrative trades.
I would like to list some coins i believe have good buy opportunity today not just because there are relatively cheaper to buy today but because of their health.
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I am of the opinion that these are coins worth investing on a short and long term basis. I also advice that you do your own research before investing into any of these coins.