Good boxers have always been a bit gobby. You need to have confidence in yourself to be good. Muhamed Ali was known as the "Louisville Lip".
I think Khan can go all the way, his opponents are gradually getting better and so is he. He has learnt to pace himself and he is bigger than most guys in his weight (longer reach/taller).
I think he can be world champ. by the end of the year.
Also, it's nice to see top quality boxing on free TV.
Can't argue with any of that.
Calzaghe is the exeption to my rule.
I think because he is a quiet guy, it has taken longer for him to get the recognition he deserves. The boxing world thrives on hype and controversy, hence boxers like Khan will always steal the headlines.