Another vote for a ptopazed Stealskull. MF, leech, 10%IAS... better than shako for a merc.
My pindlesorc merc uses a perfect ptopazed Stealskull, eth ptopazed Skullder's and an AmnAmn Tomb Reaver. He dies once per 50-100 Pindle runs which is twice as often as he did with Crown of Thieves, Gris Armor (3x IAS jewel) and Reaper's Toll, but he kills with another ~250-300%MF - nice when he has to do the job because Pindle is cold immune.