Having recently worked with a Samsung factory repsentative, I can whole heartedly recommend the Samsung "N" and "T" series of flat screens. Their 5 generations screens should be on the market in June or early July. I should also note, that Samsung is one of two flat screen manufacturers.
If you are going to replace the "Monitor", buy the best you can afford. As I type this, I am using a monitor I purchase about 12 years ago. At the time, my friends thought I was crazy paying $1,000 for a monitor alone for home use. I have had the joy of using a professional quality monitor for all this time and, while they have purchased and replace about 4 monitors in that time, I'm still using this one. Over the long haul, it's not that expensive and I have the joy of using a superior monitor for all that time versus lower end consumer products.
When shopping for LCD panels, if your budget allows, avoid the lower end consumer grade products. You get what you pay for.
A Samsung 19inch 191N is $675 to $700 delivered on the 'net. The 17inch 171N is ~$450. Both of these models have a lifespan that far exceeds the PC itself.
If you get an Analog/Digital model, you have all the support you need. Just pay attention to the "NATIVE" resolution of the flat panel itself and how it handles the "non-native" resolutions (does it have the jaggies?). Finally, don't waste your money on a 15 inch flat panel (unless you are truly a very basic user).