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I no particular order:

CWE
DE
IG
IK
CSM

I think IK is probably the bottom of the 5, and might be edged out by BA.

Of course, to some degree, mixing-and-matching between aligned factions is required to achieve full performance.

We'll also have to see what happens when the Ork codex comes out. They have the ingredients to be a very strong codex, though there's always the potential that it doesn't work out.