"Me" can be an acceptable choice. Merriam-Webster's Dictionary of English Usage on pages 627 and 628.

"Everyone expects me to turn up as the object of a preposition or a verb.[...] But me also turns up in a number of places where traditional grammarians and commentators prescribe I. Many of these disputed uses of me result from historical pressure of word position; language historians tell us that since sometimes around the 16th century me has been appearing in places where I had before been regular—such as after as and than and the verb be—because those places are much like similar positions such as after prepositions and transitive verbs—where me, or any other objective form, is usual.

"All of the constructions so far mentioned are generally accepted by commentators as historically justified. You will note, however, that they are most likely to be found in speech an in writing of a relaxed personal or conversational style. In more formal contents you may want to use I after be and after as and than when the first term of a comparison is the subject of a verb."