The pollsters

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http://fivethirtyeight.com/interactives/pollster-ratings/

So for internet polls

SurveyMonkey probably the best with high reputation, then YouGov.

Reuters, Morning Consult, and Zogby are really bad one way or another.  Though Morning consult came out with the theory that their numbers are accurate because Trump supporters aren't as likely to claim that they are Trump supporters on phone or in person.

I heard ARG is bad.  There are polls that associated internally with campaign (like I saw one from Christie campaign) so know where your source is from.  However I still trust them until if other polls show otherwise.

Basswood for example is from Club for Growth who is extremely anti Trump.  They was the first to said Trump lost Iowa to Carson.  I didn't believe them until all other polls came out later that confirmed the same thing.

And Overtime politics is a group? (not even sure if it is a business) that is like a tad more than a month old.  The jury is out on them for me.  But for most, they aren't as trustworthy.

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OH I forgot Gravis.  the problem with Gravis is that they polled usually a date after the debate.  And that swing wildly in results.  I don't trust them as well as other pollster.

To Rand Paul supporters though.  All polls are push polls unless Paul do well.

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Sorenroy provide the huffpollster link.  You can use them to remove internet pollsters and suspicious pollster that you don't like.  Huffpollster allow you to modify for trend.