For a 20inch widescreen ?
Well there is the Belinea , which is a nice MVA panel, but it has _some_ backlight issues. (There is a big thread on it).
There are a couple of Viewsonic screens coming out soonish. (VA2022W , and VX2025w ? )
There is a Philips 20 inch screen (200w6cs), but there seems to be an updated version coming out soon....or out now. There is a recent (comedy) thread about it in the forum.
umm....
There are the Dell screens, but they might have just got a fair bit more expensive.
There are probably some Acer screens too, but they're not for me so I know little about em.
To be honest I think there are a fair few people just chilling out for a bit in order to get a good 20inch widescreen, as more should appear soon.
If you could wait a couple month or so then I think you might be able to make a better purchase than if you go out and buy a screen right now.
But that's only my opinion.
edit : I was rushing when writing this, sorry for the lack of info