Which way do I go?
Right, you need to go in the direction of adequate "hotelok", the GUI on the "naked" WinAPI - this was irrelevant, as was Borland, and now, and even beautiful, it's all nonsense.
At least, you need to write your framework, so that next time was easier and the code was architecture and not to do on the WinAPI directly, but create a framework, too much effort will require, but uses it very little, it is almost certain that you have none at all, just a whim.
Well, on topic, GDI+ use, you can make a nice WPF, but without hardware acceleration, but OpenGL and DirectX for a GUI you just have not mastered, it is quite a long way to go.