This list bases on a few criteria, so one must do their own research first.
LTCGear has been so far good and so has been PBMining.
But i would never put money down on PETAmine, the payouts they give out is far less than what should be for 1Gh, plus other users seem to think it is a long con.
Criterias should include real world contact and reachability, a real person(s) behind this and has someone visited them etc.

EDIT: Tho thanks for doing the work, it does cut some of the work vetting these out