Sometimes you might need more height but the Technomic is too much. In that case the Technomic Deluxe is your friend. I think it only comes in 26.0, but shims work if your bar is 25.4.
One thing to bear in mind is that because of the head angle, as you raise the stem, the bars get closer to the saddle. So if you go with a significantly taller stem and make it shorter, you might wind up too cramped.