I'm currently using Brackets. Used it when I first looked into Phaser, stuck with it because it's kind of cool. Colour-wise, it resembles the Geany scheme posted by ibilon. I attached a screencap if anyone is interested.
In any case, this topic reminded me that I should try FlashDevelop sooner rather than later. It had little support for Haxe projects when I first gave it a shot, which put me off of the whole thing indefinitely.