my favourite seat on UA's B777: 21H - it's on the aisle at the front of the r/h side of E+, immediately before the crew rest area. lots of leg room and your own adjustable vid screen. ace!
failing that, 30A or 30H (the aisle exit row seats at the front of the main economy cabin) - again, bags of leg room (far more than you could want!) and your own screen. but these are next to the loos, so you can find a small (cross-legged!) gaggle of people in front of you getting tangled in your feet. but very handy for that quick dash before the seat-belt sign goes on for landing
