Well, an AKG 112 is on my wishlist, but there are other stuff I'm buying first that I need more.
As xstatic said, kicks need a lot of click in metal, that is why now I'm using the 57/58. I put it inside the kick, as close to the head as possible, so it gets a lot of low end from the proximity effect.
So maybe mixing it with a LDC on the soundhole could add some of the bass I'm looking for.
However I always run my kick tracks through drumagog, and mix the original signal with the sampled kick, or a very low sine wave.
When you guys mike the beater, do you do it from inside the kick? or from outside? And why?