man.... it is little bit unfair to compare Canon 50m1.8 to Nikon 20-35mm. The sharpness and bokeh on 50mm 1.8 with 1Ds just blow away the S5+20-35mm.... [s:11]
But, 20-35 and 35-70 are great lens. They are also cheap as used right now. Great choice! [s:47]
But, if shoot kids, I would prefer 18-200mm VR. It has no time to change lens when you shoot kids. Just my personal opinion... [s:25]