I'm happy with my 2.6m Chaos Bolts during actual Raids. 572ilevel, so I can't really see them getting much beyond 3m without sacrificing overall dps (after all, less haste = less ember generation = less Chaos Bolts).
I find BBoY quite good actually, it tends to proc very often in my case. My ilvl is still pretty low, but seeing 1,1m chaos bolts @ poorly itemized 535 is still nice when timing BBoY stacks nicely with it ;d
-Skildir ro Klofnir-