Hi Amo305! You may have made up your mind by now, but my sense is that you would be able to explore your interests fully in a Spanish & Portuguese Department. In my experience, there is a bit more flexibility in selecting a dissertation topic when working from a department that focuses on a specific language. That may seem strange, but let me elaborate. Often, comp lit departments require dissertation topics to cover at least 2 or 3 distinct literary traditions in order to qualify as comp lit. On the other hand, most Spanish & Portuguese departments allow students to write about a subject as specific as a single poem or as broad as a comparative study of detective fiction in, say, the Spanish- and French-speaking worlds. Unless you're having reservations about working in Spanish, I'd say that's the best bet.