Cage is currently 30/21 BM/Marks. I think The Beast Within looks good enough to give up Scattershot for, although losing that will be painful. But still, 30% extra dmg every 2 minutes is very nice...
Also, I'd think if you go BM, Ferocious Inspiration is a Must Have. One could go BM and finally have a noticable buff to contribute to a party/raid. Plus, it stacks well with Unleashed Fury/Ferocity/Frenzy, even with the 5% reduction to Ferocity (

), as well as Kill Command and Focused Fire.
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That's probably what I'll end up going with, if I choose to stick with mainly BM. (1 point extra, could go wherever.)
But then again, the high end Marks stuff looks very cool. Lots of nice stat and AP increases that would scale *very* nicely and make for a very strong DPS, and of course Trueshot Aura will always help a party/raid.
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That's what I'd go with if I decide to amp up my Marks more.
I'm torn though... I really like pets, and I like BM more from a RP standpoint. But then, Marks would be better in raids and whatnot. Bah... must keep poking around and thinking.
p.s., I believe with the first BM spec, when Frenzy procced on my ZG Bat, he'd be attacking with a .5 (!!!) attack speed! Yikes! There's a very good chance that he could just keep chain-frenzying and therefore keeping Ferocious Inspiration up pretty much non-stop... not to mention the stacking increases to his overall damage. Pretty cool stuff.
Blah blah blah...