What gui tool kit should I use?

For now I my project is windows based. And I will stick to windows for atleast 1 year. I know only C++ and Win32 api. My project is not a simple database application. It is heavily relying on windows memory management , process management and diagnostic function. So I have to use win32.

So kindly suggest what Gui tool kit should I use with my project so that I have least gui overhead.

Qt or WxWidgets or MFC or WTL ?