Vantage World Travel vs South America Travel

<p>Has anyone used Vantage World Travel (not the big Vantage Deluxe Travel) which is based in Greenville, SC, or South America Travel based in Washington, DC (and other So. American locations) before? We are getting price quotes from them for pre-cruise trip to Jesuit missions in Paraguay and Argentina plus Iguassu Falls, but have never used them before. </p>