Duotrope used to be my favorite, but I stopped using them once they started charging. They were pretty similar to Submission Grinder but were a lot more comprehensive and kept more accurate stats, from what I remember. I believe they still have a free trial if you wanted to give them a shot. Now I use most of the ones you've already listed but also add markets I really like to my IE Favorites list and check them every now and then to see what new calls they have.