I would do a narow red, then wider green with binding done in the green also. As a rule I usually do my binding in the same fabric as the border it is sewn to. Flows so much better to me that way. Beautiful quilt. Can't wait to see your finished work. You can try this trick I read about and tried and I feel it really helps, lay out the quilt with the different choices and just leave them for a few days and go every once in a while and check on them. A fresh perspective each time. It helps me alot more then constantly studing them. Hope that made sense.
Robin in TX