Cubase 5, Reason 5.
It took me time to read it all… Let’s see: Cubase 5, FL 10 + VST (EWQL Gold, Drums of War 2, Symphobia 1, 2 sometimes to save time) + samples + etc.
Logic pro /protools / cubase 6/ ableton live
I use Audacity. Many people underestimate the usefulness of Audacity. First off, it’s entirely free and second, there are many plugins which you can download to help expand your capabilities. I have at least 100 plugins on my current version of Audacity, and let me tell you, I’ve looked around for other sound and music programs, but I have yet to find anything as useful as Audacity for me.
On a less-relevant note, I don’t write music yet. I only do sound effects for now.