Many, many scholars will disagree with you that Jesus spoke only Aramaic.
Here is a good article:
http://www.israelforum.com/board/archive/index.php/t-3517.html
excerpt:
In Understanding the Difficult Words of Jesus, we present considerable evidence to conclusively establish that:
Jesus spoke and taught in Hebrew;
Hebrew was the language of the common person in Judea in Jesus’ day; The Synoptic Gospels (Matthew, Mark, and Luke) were all based on an original Life Story of Jesus that was written originally in Hebrew and not in Aramaic or in Greek.
These facts have long been known by scholars in Israel, but are only now being introduced into countries outside of Israel. The reasons for this are simply that our research in Israel is years ahead of publication, and second, that scholarship in this country by and large has not kept up with the research and discoveries in Israel. This is one reason I believe that the Yavo Digest can be an important source of information and learning for you, and why I sincerely hope you will subscribe to it for yourself and perhaps for some of your friends as well. There is so much that we have to share and so little of it has yet been presented in written form.
Another excerpt:
Of course, the Dead Sea Scrolls provide for us one of the most dramatic and significant of the epigraphical evidences for Hebrew. The Dead Sea Scrolls include nearly 600 partial manuscripts, both biblical and non-biblical, indicated by some 40,000 fragments. The most telling evidence of the scrolls is found in the sectarian scrolls and the commentaries on the biblical scrolls. In the sectarian scrolls, the ratio of Hebrew to Aramaic is, again, nine to one, but all of the commentaries are in Hebrew. It is impossible to conclude that a commentary on the Scripture would be written in a language other than the popular language of the people.