I… use Visual C#. And Xcode.

That's partly true. I learnt a bit of C++ in 7th grade, but when my Microsoft-employee teacher came along, we all moved over to c#.
It's awful. I mean, it is quite "comfy" when it comes to being user-friendly, but I feel limited to doing good-and-simple things. That's why I went on to try Objective-C.

Oh God why. It's just the same thing, but with Apple. Basically my programming life has been limited by either MS or Apple. Where should I go now? I have the logical/syntax basis, and I'd like to try something less constraining.

SICP

Qt 4 application framework.

Get a free Unix-like operating system and have fun. Do not install any third-party software, there is already everything you need and much more: text editor, documentation, source code...