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You're looking for neodymium or "rare earth" magnets, which are almost universally nickel plated. They're graded according to pull strength, rated as an N value. N42 is quite common and more or less the wargaming standard (although N35, even small ones, work just fine for light-duty tasks, like holding hinged doors shut). N52 is a bit stronger and are becoming more common, but they're also comparatively pricey. If you've got room, using a bigger N42 will generally give you more pull for equivalent cost.
The size is the one bit I can't help you on. At least not specifically, as I have no experience with the model in question. I can tell you, though, that you generally want to use the biggest magnet you can fit (knowing that you need to leave sufficient material around the magnet, if countersinking it).
Also, know that while the magnets have great pull strength, their shear strength is much weaker. For big, projecting parts (wings, long guns or limbs, etc.), you may find yourself better served using a combination of a pin (to take the weight) and a smaller magnet (to keep the part from popping off). Two pins and a magnet are even better, as it keeps the part from spinning.
I know that plenty of people here have magnetized Daemon Princes, before, so I'll let them weigh in with their experiences on size.
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