Bring water to a boil in a medium saucepan; add rice, and return to a boil. Reduce heat to medium, and cook, uncovered, 30 minutes or until water is absorbed, stirring occasionally. Spoon the rice into a colander, and rinse under cold running water; drain well, and set the rice aside.
Combine vinegar and next 5 ingredients in a large bowl, and stir with a wire whisk. Add rice, tomato, and remaining ingredients; toss well to coat. Cover and chill at least 2 hours.