Sublime Text 2
I've been using Sublime Text 2 betas for what seems like forever. Even the early betas were rock solid. I use Sublime Text on Windows (I really do deserve your pity) and BBEdit on Mac. I still prefer BBEdit but it's a close race.1 If Textmate and Quicksilver had a love child that was raised by VIM, it would be Sublime Text 2.
Don't be naïve though. It's a serious tool. Want to change the preferences? Here, edit this text file. Hardcore.
Sync settings and themes through Dropbox
Get the Sublime Package Control
Yes, a ST plugin for Stack Overflow
And install his Marked Bonus Pack
Jeebus, Brett loves him some Sublime Text 2 for Markdown
BBEdit is just more Mac-like and predictable. Sublime Text is magical, if you know what the magic words are. ↩