High-level UI library?

I’ve started a small tycoon game project and, due to the complexity of the game, there are no “game graphics” whatsoever. No isometric sprites, no 3D, nothing. The game is an information management game, so, there’s a lot of work to be done in UI: buttons, tables, graphs, animations, transitions, etc. Since there are no “game graphics”, UI has to be very good to make everything simple, intuitive and fun.

Does anyone know a good library for this?

HaxeUI and Mint come to mind, though I haven’t used either.