We use Infragistics for most of our needs, primarily for managing the grid and dates. In addition, we use XtraReports from DevXpress for a reporting tool.
Niether are ideal, but they offered the best hack for the dollar for both Windows development and ASP.NET, because they provide both in one set.
I would also look at Telerik, not use them, but from the fact that, as I heard, they look like Infragistics.
EDIT: As an added note, I find it better to stick to 1 or 2 sets of controls than to select an individual user from multiple providers, which makes it simple and easy to learn the structure of controls for deployment. sicne most will use some common libraries with a set of controls.
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