I ended up ordering the 20" Dell UltraSharp, actually, after Richard pointed me at it. I'd seen a bunch of those around and had been racking my brain for what the brand was.

I have two monitors with built-in speakers, and even being half-deaf can tell how terrible they both sound. I've got a more-than-decent sound system attached to my computer at the moment anyway, so am not too concerned on that front.