I tried both the Samsung and the HP. So far the HP is faring a little better. Here is a quick analysis
1) Both HP and Samsung monitors look very good. I'm a little more partial towards towards the Samsung.
2) Samsung caused a shadowing effect that I could see after sitting in front of the monitor after a while. I returned that
3) 2nd samsung caused a buzz in certain profiles (they have all these movies, photos, games, text profiles)
4) HP has a well indented based, so after using your keyboard you can push it in there
5) I cannot for the life of me get the NVIDIA and HP monitor to display 1680x1050 on the DVI port. I have tried everything including adding that as a custom resolution but the screen always goes blank. I suspect its the HP driver. It works on VGA
6) Whatever you do, if you are using a KVM with your setup...make sure you have a good KVM and good VGA cables. This is very very important otherwise you will your text starting to ghost. The lower end cables just dont seem to be able to handle higher resolutions. I didnt believe either until I used the cable from my old monitor to see if the ghosting went away and it pretty much reduced noticeably.
7) HP has speakers built in which is nice because it reduces the clutter on your desk
8) Cable management. Samsung has a nice cable management system at the back which groups all your cables for a cleaner finish, the HP doesnt have this so you can see your cables hanging off the back if you are looking at the monitor head on.
9) Both of them are TN displays, so the off angle viewing isnt the best and if you are doing work which requires attention to color detail (or spending lots of time in front of the computer) you might want to look at other options. (Just my opinion).
Last note: I havent decided whether I want to keep this or not yet. I might take the 15% hit and return the monitor mainly because of #9.
SPS, if you have any questions you can email me...I have been going through the Samsung and HP over the last few weeks and would be glad to share my experience.