Toss-up between Painkiller & Holy Diver IMO. HD has a ton of midrange "grunt" & sounds sensational in alder. PK has a little bit more output, is tighter, sounds really aggressive & also has plenty of midrange.
The HD has an A5 magnet & sounds/feels a bit more "organic" - by which I mean that you can roll back the volume or soften your pickstroke on mid gain settings & it will clean up nicely, or you can belt it on a clean sound to introduce some grit :twisted:
The Ceramic PK is a firebreathing metal beast that ought to have a government health warning printed on it :)
The DK2M comes with a Duncan JB bridge right? If so, do you consider it "thin sounding" with no "balls"? FWIW I found swapping the JB out of my RR1T for a Holy Diver was a
huge improvement. Not a massive jump in output, but a much fuller fatter midrange, more dynamics, more "life", more "body" to the sound :D
But on reflection, I'm guessing you might go for the PK instead :)