One of the best bargains in iPad-based text editing is , a $2 app that offers a clean writing interface with Dropbox integration. I wrote about this one back in March as one of my .
Clean Writer is fairly free of frills, but that's kind of the point. The Settings menu is small and simple, letting you choose between three color-schemes and three fonts, and giving you the ability to increase or reduce the font size and margin width. You can also turn auto-correction on or off, and that's the end of the options.
In daylight, I like Clean Writer's simple black-on-white color scheme, but at night it's nice to reverse it to white-on-black. There's also a green-on-black mode for those who like a retro vibe, and this one also does well in low light. In daylight, however, the iPad's high-glare screen makes the green text hard to see.