Well I apologize for having a life outside of PC...
Actually, I don't. Anyways my pick is:
Matches Played: 31
Wickets Taken: 49
Average: 21.22
Economy Rate: 3.97
Runs Scored: 219
Average: 21.9
Strike Rate: 73.98
Left arm seamer and handy lower order batsman, Vaas is another WC veteran (having taken part in 4) who raised his game on the biggest stage. His economy, average and batting average are all better than his career figures (4.18, 27.5 and 13.68 respectively). He's the 4th leading wicket taker in World Cups, with 49 victims, at a terrific economy and average. His 6/25 against Bangladesh is still one of the best bowling performances in WCs of all time, with the remarkable feat of a Hattrick off the first 3 balls of the game.
Probing and accurate with the ball, with the ability to move it both ways in the air and off the seam, Vaas is arguably the best new-ball bowler Sri Lanka have ever produced, possibly the best fast bowler they have ever produced. He is also know for his hard-hitting lower order ability, although a strike rate of just under 74 doesn't really show it (it's still higher than his career figure of 72.5 tho, oddly enough.)
Zorax's World Cup XI
Saeed Anwar (Pak '96, '99 and '03) (915 runs @ 53.82)
Chaminda Vaas (SL '96, '99, '03 and '07) (49 wickets at 21.22, 219 runs at 21.)
Sir Richard Hadlee (NZ, '75 '79 and '83) (22 wickets @ 19.13, 149 runs @ 16.55)