What is this knife going to be used for? That will have a lot to do with the steel that I would recommend. If chopping is going to be one of the uses for this knife then I would recommend a good carbon steel. CPM 3V would make an excellent choice. You will of course, have to take good care to make sure the blade doesn't rust, but carbon steels have been employed in the making of knives in the tropics and pacific rim countries for ages, and they have worked well.
If corrosion is the primary deciding factor in choice of steel then you should choose a good stainless. 440C would be an excellent choice. This knife will not be nearly as tough as it would if you used a carbon steel such as CPM 3V, L6, A2, 5160, W1/W2, O1 or many os the 10 series steels, but will definitely be better at resisting rusting.