1. Preheat broiler to high.
2. Combine first 6 ingredients. Add feta; toss to coat. Let stand 10 minutes.
3. Place bread on baking sheet; broil 45 seconds on each side. Rub with garlic. Divide tomato slices over bread. Remove feta from oil with a slotted spoon; crumble 1 ounce over each toast. Add juice, sugar, and salt to oil; stir. Add remaining ingredients; toss.