As several other posts in this thread have suggested, even FRAME stack and reach doesn't perfectly tell the tale of bike size and fit. In order to know how a bike will fit, you need to diagram the frame with the seat tube extended up as high as the saddle will be mounted and the head tube extended up as high as the bars will be mounted. Then the horizontal distance from the top of the seat tube with post to the top of the head tube with spacers and stem is the reach measurement that really matters. As far as stack is concerned, what you need really depends upon your tolerance for spacers and planned saddle to bar drop. There is no substitute for experience.