Congrats to you as well! You got admission to Iowa State U (their TOEFL requirement is way too high for me ><, so I gave up applying). I am interested in second language acquisition (esp. CALL-SLA interface, interaction approach, and instructed pragmatics), discourse analysis, research methods. I think NAU and GSU are particularly strong in corpus linguistics and discourse analysis, so that's why you stand a better chance of admission. By the way, are you an international student or American student?
Let's keep our fingers crossed for the other schools we haven't heard back :)!