I'm flying solo from LHR to LAX on an A380 and trying to figure out what the best seat is. Through work so I can only book Y, but at least can expense the seat selection fee. Right now, 70A, 80A, 80K, 81A, 81K are open on the upper deck and seem to be desirable based on some googling. Main deck has 25D open.

Additionally, there seems to be lots of open seats on the flight - lots on the middle sections in both decks, some groups of 3 on the windows on the lower deck. I'm also debating grabbing a seat on the lower deck for a greater chance of stretching out across a row if it's this empty (flight in 5 days). Thoughts?