1) I'm torn between 42" and 50" as i'll be at about 9.5' viewing distance. In my previous house, i was sitting same distance from my Sony 50" RP LCD and even though SD was sub-optimal the larger size was GREAT for movies and HD content. I actually got used to the poor look of SD to be honest.
On my Sony RPLCD, i watched all 4:3 content as 4:3 since there was no burn-in risk. So 4:3 content on a 42" 16:9 is equivalent to a 34" 4:3 image. Since i previuosly upgraded from a 36" 4:3 CRT, i didn't want to go smaller in size. 4:3 content on a 50" 16:9 is equivalent to a 40".
However, now since my media center has great zoom/stretch modes, and risk of burn-in/IR on plasma is higher, i'll watch the 4:3 stretched. So everything I watch will be larger, which makes we question whether i want a 42" or 50" version of this set.
2) How is the reflectivity of the glass? While this doesn't face a window, My living room is where this will sit and the patio glass door sits on the wall to the left so there will be glare from the side. Admittedly most of my viewing is done at night, but I hate having to draw the curtains and make my living room like the Bat cave just to watch TV..