IF (big if) you have any interest in looking at the internet on the TV (netflix and that sort of thing), look for one that is "web-ready". Consumers Reports says this about LCD v plasma:

LCDs tend to be brighter than plasma screens, and reflections and glare are much less of an issue, so an LCD TV is a good choice for brightly lit rooms. There's no risk of burn-in of static images, which can be a concern with plasma TVs, although it is less of a problem than it was in the past.

Advances in technology have also addressed problems that have plagued LCD technology. LCD TVs have had trouble displaying deep blacks, a problem caused partly by backlighting leaking through in dark scenes.
But LCD TVs haven't caught up with plasma TVs in terms of viewing angle. With most LCD sets, the picture looks its best only from a fairly narrow sweet spot right in front of the screen. The image can lose contrast, look washed out, or lose color accuracy as you angle away from the center of the screen.