StairSuppliesTM offers balusters in two styles, Contemporary and Traditional. What varies between these two styles is the turning and block length, see below for details (click on images to the left to see examples):
The turning on these balusters remains the same no matter the length. The additional length will be added to the bottom block. This makes the turnings on the balusters match the slope of your handrail.
The bottom block on these balusters remains the same, no matter the length. What varies is the turning length. This makes for a more staggered look, as the turning begins at the same point on all balusters on each step.