Some Kind Of Trouble for lower level (non-level cap) content. We try to assemble as much of an on level group as we can and then pick an instance that everyone can do. In general we run instances between leveles 20 and 65. Sometimes even as high as 75. It all depends on who shows up and what levels they are.
This is a great way to learn about playing your class in a group which can be quite different than solo for many classes. It is also a great way to meet your other kin members.