Basketball Lens

OK odd question (or maybe not!).

I am buying a 5dmkiii. The plan was to buy the 70-200L ii IS USM and this would cover my indoor basketball, football (yes SOCCER!) and sailing photography needs. But I have just picked up the lens and wow... bugger me, the idea of shooting basketball with that will kill me!

So perhaps I am back to the drawing board because I would prefer greater telephoto capability than 200mm but the quality of the 70-200 enticed me (of course). I am wondering if the 100mm L macro that i am buying will get me out of goal for indoor basketball? Or am I better off buying a dedicated fast lens for the indoor sport? Which telephoto lens would then be the "choice"? I am thinking 100-400??? Lenses must be "L"

So many questions!

Thanks

Iain
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As you slide down the bannister of life, may the splinters be kind to you.