When those of us in the Texas Church Project began exhibiting, we went with the standard "basic black" metal frames and white mats. Hard to go wrong. At home, I do have some wooden black frames, but I also have a small collection of Les McLean prints that are in the metal frames.
Framing is not cheap! It helps if you can do it yourself, but then you have to be adept at mat cutting. A good (not necessarily cheap) tool will help in that regard.
All: please forgive the evil digisnaps.