Where are your videos final destination? Web? Broadcast? DVD?
Bare in mind the fact that every consumer monitor will look differently: between wide manufacturing tolerances, people adjust their screens to their taste, not necessarily what is right. You will never have consistency in the wild. So what do you do? You use a monitor that doesn’t adulterate the image, just like audio recording studios use speakers that have even frequency responses and not Dr. Dre Beats headphones.
There are a few ways of approaching this.
The first, and the cheapest is to use your computer monitor if your videos are just going straight to YouTube/Vimeo/Mobile Devices. What you need to purchase, though, is a calibration system like a Spyder Pro, X-Rite, or Huey ($100-250). Since you’re on a laptop, you’ll also need to make sure your screen brightness is calibrated and your system doesn’t dynamically adjust it.
Calibrate with gamma 2.2 for web, or recalibrate for gamma 2.4 and you can get passable quality for dvd/bluray/broadcast.
A better, more expensive, solution is to get a broadcast quality LCD monitor from someone like Panasonic, TV Logic, or Flanders Scientific ($2,000-5,000). These come with on-screen video scopes, blue-only mode, and professional connections.
While Todd is correct in mentioning that CRT is the gold standard, it’s only in black (contrast) response. LCD, in a properly lit room, is more than suitable. Some people like using plasma displays for their improved contrast but they have issues with inconsistent brightness (put a small white square on the plasma and it will measure brighter than the same spot if the whole screen was illuminated white; it’s called “floating white point”). Chances are, if your shadows are insanely critical, then your work is to the level where you can afford to colorgrade in a theatre or get a more expensive monitor from a company like Dolby (we’re talking prices like $15,000).
Food for thought.