When the South Africans returned to international cricket, they surprised everyone by their high fielding standards, which were consistent throughout their team. A direct-hit run-out by Jonty Rhodes set the tone, as they emerged a new power in world cricket. The Sri Lankans, in the late 90's, were an average bowling unit and slightly-better-than-average with the bat, but their fielding won them many a match. The present Australian team has set very high standards as a fielding unit, winning tournament after tournament. The fielding has made their bowling attack more penetrative than it was otherwise.
Now it's your turn to dig deep into your team's reserves and put together your team's best fielding XI. While some may end up putting bits-and-pieces players who are excellent fielders, this should be your most feasible XI. Not individuals, but a whole team that fields well.
EDIT: Please specify if this is a current or an all-time XI.