Improved Lute Strings of Greater Subtlety <-- I think that's still the best one available.
Lute strings are extremely easy to make and can be used at a very low level but still in my experience they don't seem to be used too widely. I hardly see them on AH on my server, and I once made a bunch of them just to see how well they sell but no one bought them.
My Minstrel just recently started using those -12% Healing Threat lute strings but it's hard to say yet how much they actually affect my group play. What's your take on this, do you think they're overlooked or am I just failing to see that they're used quite commonly?