I don't know of any tv's other than the Toshiba Cell that incorporate a central processing unit (cpu) into them. If you're talking about computer use, I would recommend Pioneer or Panasonic plasmas, turn on orbiter and turn down the brightness/contrast a bit. Run windows 7 and use a slideshow wallpaper 10 second turnover and don't keep any icons on the desktop. Have the taskbar set to auto-hide. If you're talking mostly as a media machine a plasma can handle that fine. If you're talking as a work station monitor or something like that, it's probably a bad idea. Avoid Samsung and LG for pc use since they are more prone to IR, but really you probably want either an LED-LCD or DLP if you care about quality but want heavy pc use. It'll cost more and probably not be quite as good, but you won't have to worry as much about IR/BI.
It also depends on your behavoir partly though. The same rules that applied to CRT still apply. Turn it off when you're not using it or in the very least minimize all windows so the desktop is the only thing showing so you aren't leaving windows all over the place to burn-in when you aren't around. The other thing you'd need to watch for are popups from windows that appear when you've left the room. Another good reason to get in the habit of turning it off instead of just leaving it running.
Overall, plasmas will be the most sensitive at the start of their life. Baby them a little the first few hundred hours and IR will be much less of a concern. So it's probably best if you do go plasma to avoid using it for pc the first several hundred hours. After that, they're reasonable as long as you don't get in the habit of leaving windows etc... sitting up there for long periods of time on a regular basis.