I don't know about Chicago, specially since Boozer got injured again.
It's possible, but we have to remember the competition on the East is very fierce this year. Orlando, Miami, hell: even Milwaukee will give teams an hard time.
But yes, I definitively agree with you on Oklahoma. We saw the trouble they caused to the Lakers last season. They basically are the same team one year older, so we could perfectly see Durant lead them to the Finals.
I wouldn't mind a Final like that. One of NBA's greatest qualities is the ability to give the fans something new and unexpected!