Interesting, I did a bit more digging and it seems that the Catholic Encyclopedia speaks in favour of 1 maccabees being originally Hebrew. No fragments survive, but the witness of Jerome and the stylistic features suggest it was originally Hebrew. http://www.newadvent.org/cathen/09495a.htm
A few more articles, and it turns out that 2 Hebrew versions of Judith survive, but they're different lengths, and we can't be sure if either of them is actually the original. The writer of the article wants to say that the longer one is a version of the original, though. http://www.newadvent.org/cathen/08554a.htm
And apparently the original language of Baruch is up for question. Those who argue either for a Greek or a Hebrew original both claim that the linguistic features are on their own side. No Hebrew version survives, but the marginal note in a manuscript apparently alludes to a Hebrew version at the time of the commentator. It is a bit difficult to argue that this Hebrew version would have been the original, but it might have been. http://www.newadvent.org/cathen/02319c.htm
I also found a table of the original languages of the deutero-canonicals, or at least one person's summary. I think I'd be more inclined to put Baruch in the Greek column.http://catholic-legate.com/apologetics/scripture/Articles/AreDCBooksPartOfTheBible.aspx
I just recently bought a Septuagint and I'm really happy I can read all of the deutero-canonical books in Koine Greek now. But there's one thing I wonder.
Which version, if I may ask?
I actually bought two because the first one didn't have what I needed. The first one I bought was Brenton's Greek and English Septuagint, published 1970, but I was quite disappointed by that because it only had the Protestant Old Testament with none of the apocrypha (I was being cheap and ordered it second hand without checking its contents
). But then I ordered in the Ralfs-Hanhart 'Septuaginta', revised edition (editio altera), two volumes in one, pub. 2006. And that one is great, a much handier size than the massive Brenton, and it has everything I wanted. It even includes all of Maccabees 1-4, Susanna and Psalm of Solomon. The pages are crisp and clear, the binding is lovely, and I really really like it.