my suggestion:
sony lcd, led backlit, 120hz
size will vary based upon how far you will sit away from it.
if it will be 3-5 feet away 30" to 40" is sufficient.
Reasons:
sony is the only manufacturer to 100% back their tvs with parts. my cousin is a repair tech so he can vouch for that. not the best warranty in the business, but if you want to fix your tv post warranty it is a huge plus.
led instead of ccfl backlighting is more uniform, can achieve higher contrast ratios, and *should* last longer while generating less heat.
120hz isnt really needed but it does smooth out moving images... though even most 60hz have zero ghosting!
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reasons why to avoid plasma:
they are prone to failing within only a few years. believe actual results and not mtbf labels. they are also very expensive to get worked on. again, my cousin is a tv repair tech.
plasma doesn't have better color than any decent non trash lcd. keep in mind that if it is your pc monitor you will have vibrancy turned way down anyways or you'll go blind (well, it will hurt your eyes anyways)
plasma does have a better contrast ratio than older lcd tvs, however the new led lcd tvs are excellent. my old lcd monitor never got real dark.. the only time you notice it is when you deal with pure black on the screen.