I would agree with Semi On. Plasma quality isnt as nice unless you are willing to spend over $15,000 canadian for the high end plasma.
The best picture I found with smallest footprint would be the rear projection LCD with range in the 40 -60 inch Wide format and some only having 14 inches in depth.

The best looking one
http://www.sony.ca/sonyca/home.shtml
select the Sony Store and search for rear projection LCD

http://panasonic.ca/English/audiovideo/television/projection/pt40lc12_45lc12.htm





http://www.quadloft.com/hometheater- new HT