There are a bunch of good pools out there but make sure the admin of those pools are honest and open with all their members before sending any hashing power to them.
Or you will end up not receiving payment from them even after you have completed blocks for them.
It has happened to me several times already.
And make sure they have a group for members to respond to them and their team so to solve any issues right away and not be waiting hours or even days for them to solve their problems with the sites they provide to their customers, the miners.

A lot of scam pools coming out of the word work now making themselves seem as a legitimate pool.