Nothing to add to the suggestions for conventional frames, but you might like to consider what we call "Caisses Américaines" over here. The photo is glued to a rigid substrate which is then mounted inside a surrounding frame but spaced away from it. Difficult to describe, so here's an image that gives the idea :
The advantage is that the space creates a shadow line around the photo which I find attractive, the print is of course not protected in any way, however, I tend to regard prints for display as disposable - I like to change the decor every now and again !
Most photo labs provide something similar.