I would go with Symbian from that list. I always knew that PalmOS needed a ways to go to really be a contender, so I didn't waste any time going to WebOS as soon as it came out, but that was 2009, so wouldn't make your list. Never much of a Blackberry fan... If Windows Mobile was on your list, I would say that. I think at least WM6 was out by then. I still remember my HTC Apache and Touch Pro...