I read through a good deal of AGR's stuff a few years ago and found some of it really interesting. I suggest his two books "Ruach Qadim" for a wide ranging set of arguments for Aramaic NT primacy outside of his Aramaic translation of the New Testament. I think it's unfortunate that the Messianic Jews are the center of attention in Aramaic NT primacy, but this is probably predictable since Jews would be the largest group of people we regularly deal with who have some skill in Aramaic.
For another interesting read, I suggest a book that provides a large number of proofs demonstrating Aramaic primacy (free!):
http://eaglefeather.org/series/Ancient% ... 0Greek.pdf
The author of that one eventually left Christianity. But, I've talked to others who are heavily persuaded by this position (and still endorse the PDF) such as David Bauscher. If you're interested, Bauscher has published a parallel NT based on the Aramaic texts:
http://www.amazon.com/Comparative-Centu ... PBRQHQA8GM
I'm not completely persuaded by their arguments, but I think there is more to them than we usually accept. I think it's interesting that Eusebius stipulates that the New Testament could be found in languages other than Greek very early on (far earlier than the traditional 400AD+ date allowed for the Peshitta Aramaic). I think it's very significant that Josephus claimed not to know Greek, to have failed to learn it well enough to translate "Wars of the Jews" from Aramaic, and to have needed to hire a professional Greek translator for the work instead. I would also point out that when Paul spoke Greek to the Roman commander he was a bit surprised by this, which wouldn't make sense if even Galilean fishermen knew Greek well enough to write letters in it. In any case, I hope someone takes the time to refute each of the examples in the free PDF (no one has bothered to do so to my knowledge).
Doug