I'd stear clear of plasma if you are using for a dedicated / primary computer display. While plasma technology has come a long way, and you wouldn't have to worry about burn in from normal media usage on a modern set (varried gaming / dvd / BR / etc...) I still wouldn't recomend it if you plan on having a desktop on there for a long time. Things like the start menu probably will burn in long term...
Take the above with a grain of salt. If you know that you won't be spending a lot of time on the desktop, and will be varrying the content, then a plasma might make a great display for you. It certainly would be my choice for gaming / movie watching / etc... (actually I just bought a 63" plasma). There are a lot of things that plasmas do VERY well; however, I would stear clear of them if you are planning on using the set for a primary monitor (secondary monitor to game / watch media on would be another story).
What is your budget? Is form factor a concern (IE: do you need one of the new 1.2" thick moddels?). Vizio just came out with a new 55" LCD with local dimming the VF551XVT. The model that it superseeds (the 550) is a very nice set for the price, and the newer set packs a hell of a lot of tech into the price point (though it will be replaced by another model 552 fairly soon). Samsung's edge lit 8000 series have a pretty nice picture and great black levels for an LCD; however, the few that I have seen in person did seem like they had some banding (and they aren't cheap sets). For a standard computer monitor, I would assume that ccf backlit would be more than sufficient (but again, the led based displays generally are going to have the edge as far as blacks are concerned for gaming / blue ray / etc...).
If you do decided to go for a plasma, the panasonic 54V10 would be a nice choice in a similar size... I just bought a samsung 63b590 myself... and I like the set...