Just an update for you guys.

I found the bottom bolt on the left mounting bracket to be slightly loose (though no movement was allowed, so it's not an issue). I was unable to tighten that (because I have to take out the LCA bolt to do that, and I was on my lunch break) but I did squeeze as much White Lithium Grease into all of the bushings on the swaybar and the Lower Control Arms as I possibly could, without taking the bushings themselves off.

This made for a half-ass lube job as I doubt much actually got INTO the bushings, but my preliminary -- 2 mile drive up and down speedbumps and driveways (that would normally replicate the noise) has shown, no noises.

So, it could have, in fact, been the lack of lubrication on the bushings.