Assuming this is for centrepulls and downtube shifters, for the gear cables any stainless and a matching outer should suffice; for my Weinmanns I've got decent service out of Wiggle's own-brand compressionless outer and stainless inners. IME once you're above the dirt-cheap level, decent cable prep (outers ground flat, decent ferrules etc.) is as important as anything else, especially for non-aero cable runs that are automatically more forgiving.
Assuming this is for centrepulls and downtube shifters, for the gear cables any stainless and a matching outer should suffice; for my Weinmanns I've got decent service out of Wiggle's own-brand compressionless outer and stainless inners. IME once you're above the dirt-cheap level, decent cable prep (outers ground flat, decent ferrules etc.) is as important as anything else, especially for non-aero cable runs that are automatically more forgiving.