I've had reasonably good luck with VGC Bald Moon Yellow. I say "reasonably" because, like pretty much any yellow, coverage is less than fantastic. Over a solid base (I use Iyanden Darksun, I'm sure there's an equivalent in the new line and others), though, it works up nicely after a few thin coats.
Haven't paid much attention to the new Citadel line, so I can't comment on how close of a match Flash Gitz Yellow is, let alone how well it performs.
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