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So the noise came back after I replaced the failed lifter. Turns out it was a bad cam chain tensioner. If you're experiencing these symptoms I'd recommend you pick up a mechanic's stethoscope (About $5) and listen to the area around the front of the motor. My "clack clack" noise was most prevalent with the stethoscope directly on the tensioner bolt as well as around the Vanos solenoids. From what I can tell, the OEM unit is made by Febi, but don't quote me on that. I picked up mine for about $35 shipped from Pelican. The unit was virtually the same, except with the BMW etchings filed off. The spring resistance in the new unit was significantly stronger.
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