How do you guys select the ones with the potential?
What sites do you check?
What are your criteria?
Do you have some system?
I believe you have incentive to share this information because more of us invest in one coin, more the price is.

There's a lot of altcoins here were you can choose to invest in, aside from that the things I can suggest you to invest in was Try ICOBID here is the ann thread
https://bitcointalk.org/index.php?topic=1605034.0 you can read the specification together with their features program.