Alternatively you could use a customized build of devC++, that you are already familiar with but with enchantments for wxwidgets.
http://wxdsgn.sourceforge.net/
Nathan: If you look at Qt and WXwidgets I think Qt has much more intuitive classes and easier ways of doing things. with wx it seems to me like everything is crytically named and you need to memorize completely unintuitive things. But thats just my opinion. I haven't done much development with wxwidgets (only basic examples).
If you go to zetcode.com they have examples that do the same thing in QT, gtk, wxwidgets ect... I think wxwidgets is the most unintuitive. But you can decide for yourself. Whatever works for you is the best.