There is a whole forum devoted to this general topic:
http://www.avsforum.com/avs-vb/forumdisplay.php?s=&forumid=40
After a few weeks there, here what I decided. First there is not a universally accepted High Def spec here in the USA. As a matter of fact, the best spec out there 1080p is not even in use yet. So I went with Enhanced Defination format over HD.
Second, LCD versus plasma versus rear projection is a matter of personal taste. 911 vs. 914 vs. 928 kind of deal. FWIW, I went for plasma.