I think 2020 would be a good choice. 2117s might work but they spine about 81lbs and I don't think you need something that stiff. On the lesser side 2018 might work and if you had some different spined arrows you could tell for sure. But I think 2020s will work fine. If you were going with woodies I think 70-75 lb would be the ticket for the bow you described.

A lot of people shoot arrows that for my bow would not be stiff enough. I have a McCullough Griffin longbow, 59@29, and I have to have something that has at least a 75lb spine. I can shoot 2117s and if I were going with aluminum the 2117 shaft would be the one for me. My woodies are 75-80.