Hey there mate,
Any out of the Painkiller, Nailbomb or Miracle Man would be great for the melodeath sound. The Painkiller being the middiest and probably the tightest, the Nailbomb being the most grindy and organic, and the Miracle Man having a more scooped feel. All three are very clear indeed.
The Nailbomb neck is lovely, quite a vintagey, PAF-y sound, but very clear even with loads of gain.
The Painkiller neck is incredible, fat and really fluid. It's the only ceramic neck pickup Tim does, and has none of the harshness or sterility you often find with ceramic magnets.
Before you decide, I'd really advise contacting Tim, either by phone or email, to make sure you're getting the best pickup for your needs. He is incredibly helpful and always give spot-on recommendations.