The Layer Slider is the slider I was referring to in my Ally theme 馃槈 Lot’s of people have used it and love it, so I’d say it works pretty good.
I know you want to use full width background images with text on top, and this is perfect for that. I didn’t do it in the Ally theme demo, but you can easily do it with this plugin. I haven’t really used any other plugins that do this.