Also, about Knock-Down, the (minor) confusion is that it's in the "Divine" (as in Gods) section of the SRD, seemingly only open to deities even though it's tagged [General], but from where the feat is from (Deities and Demigods p.51), in the feats section entry it says that those feats were originaly designed to be used by PCs, plus it being tagged [General].. so it's fine to take it I guess.