For movie watching, the SMPTE minimum recommended viewing angle is 30 degrees. For a 6 ft viewing distance that corresponds to a 43" 16x9 format screen. Following THX guidelines you could go as big as 50 inches, which would yeild a 35 degree viewing angle. You are probably not going to like the way NTSC sources look at this distance but HD and good DVD's should be OK. Always best to try it out first.
Calculations from viewing distance calculator.
I was eyeing either the JVC 48 inch 16:9 or the Hitachi 43 inch 16:9-looks like the Hitachi fits my needs while the JVC is too big. Im replacing a 36inch Toshiba HD direct view-its my second one & both have had major problems. The store I bought it from doesnt have any other HD 36 inch direct views so I have to look at RPTVs. They also have a 42 inch Toshiba in my price range, but after going through 2 of thier 36hfx71s, I am a little reluctant to get another Toshiba