The EF-S 17-55mm f/2.8 IS USM is an excellent lens - it's on my camera most of the time. The f/2.8 makes it suitable for use indoors, and 17mm is substantially wider than 28mm - you'll want that extra angle of view, I think. Spain has some amazing vistas and architecture. Take along your 55-250mm for the longer shots.


Have a great trip!