In a 4- to 5-quart pan over high heat, bring 2 quarts water to a boil. Add pasta and cook, stirring occasionally, until tender to bite, about 10 minutes. Drain.
Meanwhile, rinse, core, seed, and chop tomatoes. In a large bowl, mix tomatoes, basil, 1/2 cup feta, garlic, and olive oil. Add hot cooked pasta and mix well. Add salt and pepper to taste. Sprinkle with remaining 1/4 cup feta.