wakkoguy,
all the comments here are very helpful as i read this thread. I've been a Audio/videophile for about 20 years, and Display technology and presentation has been my biggest hobby. Its not as simpl as "buy a plasma or LCD" (LED is an LCD, its just lit differently, its not a different technology - dont be swayed by the fancy marketing).
There is no finer consumer display on the market than a Pioneer Elite Kuro - Signature Series PRO-141FD, 60-inch Plasma display. Of course, it would have to be calibrated by a trained ISF Technician...not a best buy geeksquad or magnolia theater installer. So, my suggestion, start your research with that Display, and work your way out of it.
Sadly, Pioneer could not continue its production (cost too high, demand too low).
Even today, there are still NO "Kuro Killers" on the market. The closest one might get is the LG Infinia THX Certified models (very few left) and Panasonic was kindof going to produce the panels for Pioneer in the end, but not sure they got hold of the receipe for success.
lastly, as important as the display panel, and the subsequent calibration (HD color points differnt than analog...keep that in mind), is the viewing environment... including the color of the walls, the backlight behind the display to match 6500Kelvins.
Heavens, thats a lot of work just to show pictures to a client... and a whole 'nother hobby altogether...
okay, skip it all and just buy a nice 19" CRT and your pictures will look astounding (if you at least have even that calibrated
)