I use my index and ring fingers barred, but then I also lay my middle finger on top of my index finger and my pinky on top of my ring finger.
I learned that trick from a magazine a long time back. It feels much more comfortable now, and it really helps avoid cramps when you're playing for a long time as you're spreading the load of holding the strings down between four fingers instead of two. It can be quite tricky to get the hang of, but personally I think it's worth the effort.