Like chrismahon says, the choice is endless!! some breeds are easier to prepare and keep in show condition than others. For instance, A RIR is far easier to condition and keep clean than a Poland or a Sultan! White birds of any breed can be a nightmare to keep white! Feather footed breeds often need a little care and attention to keep their footings intact, and other breeds with Well developed combs and wattles like Rosecombs and Minorcas, require careful feeding and housing to keep these sometimes delicate features in tip top condition.
As a first time Poultry exhibitor, breeds like Wyandottes, RIRs, Australorps, Sussex, Welsummers, Maranses etc, in other words , breeds with less 'frills' and 'fancy' points are good breeds to show.