Okay, with a stretch mode capable RPTV, as an example the new Toshiba 50hx81 your options 1-4 would all be viewable as full screen. No black bars. I am not sure what you mean by option 5. Since you are using the same source signal in 4:3 mode as 16x9 you would not see any more detail in 16x9 mode. Also when scaling an originally sourced 4:3 signal the stretch modes will change the geometry going to 16x9, an example people might look a little compressed. But most people acclimate to this very easily. If the stretch mode does some scaling and also lops some of the sides of the image you may not get this compressed effect at all, just as if you had "zoomed" into the image.