At first glance, and without doing any research into the current market, that Dell looks good and the price OK. It's IPS, same as my Asus. I vaguely remember comments about Dell IPS monitors having a pink hue, but that would be several months ago and probably fixed by now, but you might check on that.
I don't know about 1920x1200 vs 1920x1080. Either will display full HD at 1:1 so 1080 sounds OK. 1920x1200 would give you a bit more screen "real estate" for other work though. But the market may have moved to 1080 since I was shopping.
For previewing video and other media you should calibrate your monitor, which means measuring what it is displaying and adjusting it accordingly so that you know what you're going to get when you colour grade footage etc.. There are calibration devices (colorimeters) around such as the Spyder and the Huey which will measure the output of the screen and then create and load a colour profile which adjusts the screen with software, as opposed to using the monitor's controls. I bought a Spyder 3 and I wouldn't actually recommend it because I absolutely hate the software that comes with it. Really unintuitive to use and the utility they provide for loading a colour profile conflicts with Adobe Flash Player and causes crashes.
Versions of Vegas Pro up to 10 allowed you to load a colour profile via that drop-down menu that you can see in my screenshot above. That has now been dropped in version 11. Presumably they now intend you to load a colour profile using the colour management features in Windows, which were greatly improved in Windows Vista. Unfortunately I am still on XP, on which Windows colour management doesn't really work properly, and I have ended up having to adjust my Asus using its controls.
There are software-only tools such as Calibrize that get you in the right ballpark and may be enough without buying a hardware colorimeter. Your graphics driver should have a utility too. My Nvidia driver has a "display optimisation wizard". The most important thing, if you have multiple monitors, is that your monitors match each other, and that can largely be done by eye.