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.

I am working on a model/method for quantifying this type of evaluation. It will turn into a whitepaper eventually but the first thing you need to decide is how you are trying to invest in coins, e.g. short term or long term. Even that decision is riddled with controversy.
People's motives for trading are very different so their motives for sharing information will also be as varied.