I love my 25mm lens on my F3 so I wouldn't go without a wide (the 24mm) I my bag I also carry a 50mm (or a 55 f/3,5 mikro) and a 85mm.
So I'd take those focallenghts or maybe a 35mm instead of the 50 (don't own a 35mm) and the matching Camera for them. A backup camera would certainly be a good thing.
Best regards