PPS - I dont stream HD. I have my Roku Box set to 480p Anamorphic.
I tried to stream 720p HD from Netflix with my Roku Box, but I didnt like the buffer times, but more than that, they looked worse than 480p Anamorphic streams, due to limited bandwidth. I also tried 480p 4:3, then zoomed but the 480p Anamorphic wided seemed to be better quality, and the best compromise.
Epson 8350 / Panasonic AX-200u / Optoma Graywolf 92" / Draper Luma 92"
Samsung 51F8500 / Panasonic P50ST60 / Vizio P502ui-B1 / Sony 50W700B LCD
Sony S790 / Panasonic BDT-220 / Roku 2 XS & Roku 2
Samsung F550 / Speakercraft CS3 / Yamaha YAS-105