Sorry to go back quite a few posts...
Consistancy?

Think about it, apart from his 223 against the West Indians, what has he done at international level? That innings, 93* later in the series and 83 against South Africa just bolster his average to 31. Take those three innings out, it falls to 16.4.

If he couldn't prove himself in the 15 Tests he had, he didn't have what it took at Test level. But then saying that he hit a double ton... vicious cycle there.

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"Being second is to be the first of the ones who lose."
- Ayrton Senna

On the list I think AB De Villiers but I have to agree that Tres is the most under-rated. He has put many huge stands together with Straussy at the top of the order and they go over looked because people such as Pietersen or Flintoff come down the order and steal the show with their big hitting hundreds .

Ashwell Prince ... is very underated ... most consistent player for SA.
Will need to help Kallis play a stabilising role in the WC.

I also think that it is Chanderpaul. Sarwan has not fulfilled all that initial promise, while the toher names mentioned are not better than their actual rating in World cricket. SC looks rather fragile and innocuous, but has the capability of quickly changing the face of a match with his deceptively aggressive batting. The only question is his mental state; despite his serious look while batting, I feel that SC sometimes lets his concentration drift and gets bogged down.