Tom, that's a great list you just put together. hands down, my favorite reads have been the first person accounts. I would add a couple to this that really stick out in my mind:
Willie Coppens - Flying In Flanders (or, Days On The Wing, if you will...)
Bert Hall - Either one: En L' Air or One Man's War. Yeah these are loaded with Hall's self serving bullshit, but entertaining nevertheless.
Elliot Springs (well, mostly his) - Diary Of An Unknown Aviator
Arch Whitehouse - The Fledgling (Easily his most vital work)
Billy Bishop - Winged Warfare (I know this one always seems to stir controversy, but it's a fun read)
Gordon Taylor - Sopwith Scout 7309 (for after you read No Parachute and you just can't get enough of Sopwith Pups....)
That's a little list anyways!