That's a good price for what amounts to a professional signage display but I'd advise some caution. First of all: how has it been treated and how long has it been in use? Used plasmas (especially business displays) may have significant uneven wear / burn in if they were used to display something with a static logo or even a short promo loop on repeat. Second: these pro displays are monitors NOT televisions which means they often lack niceties you might take for granted. I see the PF20U has speakers at least but it has a total of one HDMI port and BNC connectors for component video. This means you'll need HDMI switching to plug more than one thing in at a time and you'll need adapters for all your analog sources. The pro series are also built like tanks-- the 65" weighs 121 lbs so you'll need a hefty wall mount.
Not trying to talk you out of it just trying to make you aware of some issues you may run into.
Large LCDs are no cake walk either and the problems that plague LCD tend to be an even bigger issue as the size increases. Be wary of uniformity, viewing angle and pixel pitch as you scale up. Some cheaper makes have terrible uniformity, poor viewing angles and I've even seen a fair amount of SDE and DSE on modern displays which is pretty much unforgivable at this point. I tend to favor IPS as the viewing angles are better even if the contrast/black levels suck (it's LCD so I'd rather be able to see it from the side than get slightly better blacks which are still far inferior to plasma/OLED). The good news is LCD continues to advance and many of the new models have 4k resolution which really does nothing for you at flatscreen sizes but at least solves the issue of screen door effect. I've also seen a number of models go back to backlit or 'direct' lit displays which tend to have better uniformity than the ultra slim edgelit models.
Ultimately, for size you want front projection. But that too has it's compromises. There are models that will perform well in a room with the lights on and those that will perform well in a batcave but rarely will one do both. My DLP projector gets just bright enough I can leave a couple lights on and looks convincing enough in the dark but it lacks the brightness of an LCD during the day and the black levels at night.
What to do if you find yourself stuck with no hope of rescue:
Consider yourself lucky that life has been good to you so far. Alternatively, if life hasn't been good to you so far, which given your present circumstances seems to be more likely, consider yourself lucky that it won't be troubling you much longer...
-- Excerpt from the Hitchhiker's Guide to the Galaxy.