I don't know if all these recommendations are specific to Orange, but if not please take into account that most people find that retro Oranges seem very small for their size. Plus as has been said, a retro Orange size 17 had a very short head tube and a short fork, so it is very low at the front.
I am 5-7 and I commuted on a C16-R size 19, which was very comfortable. I think you might find a size 17 too small for you.