Recommended 2D GUI library

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Can anyone recommend a 2D gui library? I'm wanting professional quality results (speed and accuracy of images, don't mind paying) which allows custom button graphics etc. and different control types. It also needs to be scaleable to different resolutions preserving the same aspect ratio. eg. I want a square frame for rendering a 3D view with controls on the right

I'm browsing through the Toolbox/GUI libs at the moment, but would like real user feedback as well. Don't really want to try out a dozen different trial versions!