Do you own $BRK-B? I've always been in favor of indexes where I peek continuously, but $BRK-B is quite tempting :)
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JB
If you can answer the question of why you are attracted to it and what will give you more than the index, then go for it. For me, it's sort of 50:50 between the index and BRK, but I'm leaning more towards Berkshire.
DD
I'm pretty much 50:50 right now too, and so far it's more about seeing that BRK might be a little more yielding.