Hi Gimli!
Speaking from experience, the bigger you can go without breaking the bank the better.
After you've decided what amount you want, make sure its got all the connectors you want, whether thats DVI, VGA, Display port or HDMI.
Depending on your equipment you might want to have a look at the new display port monitors as that makes your new monitor future proof and in keeping with the current trends. If you are less bothered about this any DVI connection would be fine.
Have you thought about a dual monitor setup?
Believe it or not this kind of setup is very fashionable - Amongst my 7 monitors 4 of them are on a dual monitor setup. This means I have more space to put a youtube video on screen with a laptop whilst using msn on another.
Another point worth mentioning is your space, there are monitors by samsung that are extremely thin, perhaps these would be better if you do not have much desk space?
Refresh Rate
What about your refresh rate? have you considered a 120hz monitor?
The smoothness you get from a monitor at 120hz is remarkable, it really does make the viewing experience nicer when watching films or playing games, for the little extra price they cost, they are worth it in my opinion.
As for brand, My three best choices would be HP followed by LG followed by Samsung. They seem to be the best for value, performance and size.
As already mentioned, be sure to know what kind of monitor would be best in your room. A gloss finish looks nice but gets finger prints easily and when infront of light sources can make it horrible. A matte finish would be better in this situation, however if your looking for looks over everything else glossy is the way to go.
Bear in mind that if you buy a glossy one then move the monitor, you can purchase gloss screen protectors I think they are called. These basically turn the glossy screen into a matte one, but in my opinon matte is the way to go for the pratical bonuses it gives.
As for the monitor you pointed out, I saw no problems with it

Even better if its in a bedroom as it means you can use it as a TV too! Does that mean it comes with a remote? Not many monitors have a handy option like that!
Keep me posted and good luck with your purchase!
Regards, DellStorm