Super 2d/3d Graph Library is probably the best .NET charting component for most users: 39$ or 55$ (lite or premium edition), royalty-free, free email support, same component for web and winforms applications, high degree of personalization, more than 30 different chart styles (2D/3D), advanced features such as chart combos, ClearType support, antialiasing, high resolution rendering (eg. 300 dpi), additional calculations, and more!