Ask HN: What's the single best decision you made as a founder?

Mine would have to be re-writing Disrupt.fm using the CodeIgniter Framework. Although I had already been live for about a month, I knew if I wanted to scale and add new features, my spaghetti code wouldn't hold up. I had read horror stories about code re-writes but I went for it anyways.

It's almost ridiculous now how fast I can add a new feature to Disrupt.fm...What used to take days now takes hours, and the site is much more secure, stable, and structured for easy maintenance.

So HN, what's the best decision you've made regarding your startup?