Gradually we are giving you reasons why printing frames are so attractive. If you go this route I would suggest an 8x10 frame which leaves room for the 5x7 paper and some moving around. I have gotten two different sizes from Bostick & Sullivan that I like (8x10 for 4x5 negs and 11x14 for 8x10 negs). Our friend Bill Schwab built the one I have for 7x17. My guess is that he is a little busy with other things now, but you never know. Be sure to find one with strong springs on the back or you end up no better than just the glass.