I also have been trying to hunt down a good quality LCD to accompany my 1.8DP. I was going to go for the Samsung 213T 20" (~$1150) since the specs looks pretty decent (other than its response time), but decided to go ahead with the new Apple 20" cinema. The EDU price is only $1169, making it reasonably competetive with the other 20" lcds considering the wide aspect (16:10) , the additional ports, and its decent specs. I couldn't find any other wide aspect 20" LCDs.
You actually get more pixels with the 5:4 aspect 20" LCDs (150 more vertical pixels, 80 less horizontal pixels), but I like to have my tools and palletes always open to the side, so the 16:10 works much better for my work. And it doubles a little better for DVD widescreen playback. Plus, the apple design is very slick. I found it humorous when Jobs said that back of the new Apple displays looks better than the front of their competitors. It's true though. Design has a cost, as you probably remember the samsung Porsche ("P") models (171P I think?) also demanded a premium when the P series were designed by Porsche. The downside to the Apple in the single DVI input; it would have been nice to see a dual DVI/VGA input so it can be readily shared between two machines. Morevover, the reviews aren't in yet, but I 'm hoping Apple lives up to form.
For me, my first choice turned out to be the new apple 20" cinema, followed by either the LG 2010p or the Samsung 213T. The Formac 2010 also has impressive specs (also priced about the same), but I've read mixed reviews about the stability of the company, and the design also needs the alum facelift, and no one has them in stock. The Dell 2001 has been getting mixed reviews, but is priced better than all of them, usually below $900.
I decided against the 19" because you basically get the same resolution (1280x1024) as the 17", thus you end up with fewer PPI, so I'd stay away from the 18" and 19" displays for that reason.
The iMac 17" widescreen at 1440x900 would have been a hit for most people and probably could have been priced around $799. Other existing 17" widescreens (e.g., Samsung 172w) only have 768 vertical pixels (same as 15" lcds) just don't cut it.
Good luck with your purchase.
PS: the Samsung pivot feature does not work with the G5s AFIK