Minor changes in my ranking:
iRex 800 has grown on me (
https://www.mobileread.com/forums/showthread.php?t=70664).
#13: BeBook (a bit ugly, looks a bit cheap)
#12: Sony 300 (don't like turning pages with the 5-way-button)
#11: Sony 700 (great unit, but given Sony 600 it has lost its place)
#10: Cybook Gen3 (nice unit, especially after the firmware update. But no real arguments against Kindle 2 and others)
#9: iRex 1000S (great unit, but too bulky for me)
#8: Sony 600 (very pleasant surprise, but given Sony 900 it has lost its place)
#7: Kindle DX (flawless, but the big screen doesn't have any real advantage to me and makes it bulky. Maybe with more advanced PDF support?)
#6: Sony 505 (still one of my favorites, but no real advantage over Sony 900)
#5: iRex iLiad (still one of my alltime favorites, but replaced by iRex 800)
#4: Cybook Opus (only a niche product for me, 5" often difficult to read. But within its niche it's phantastic)
#3: Kindle 2 (there's a reason why Amazon is considered market leader)
#2: iRex 800 (has grown on me and we've learned a lot in our dialogue with iRex)
#1: Sony 900 (a real beauty. Display quality a bit below iRex 800, but more than acceptable)
As always, absolutely subjective evaluation.
My ranking can't be a purchasing recommendation, we all have our own demands.
So my ranking reflects "probability to take the unit with me on a trip when traveling light and not taking all of them".