Lovelylil,
Are you after an Interlinear or a straight GNT? With some professors, being caught with an interlinear in class is pretty high on the list of cardinal sins. Others require it --Go figure.
If you want a good GNT, you could purchase the Nestle-Aland Novum Testamentum Graece from the American Bible Society.
http://store.bibles.com/ProductSearch.aspx?s=nestle%20aland
It's a little pricey even in paperback, but worth it if you plan on pursuing this endeavor
IF you want an Interlinear, the KIT is not as bad as is commonly claimed here and elsewhere and you could do much worse. (Like the god-awful CLT for example) But if you want a translation more sympathetic to evangelical theology, you can get an NIV Iinterlinear from Amazon in a variety of bindings