iPhone 5 photo editing

I have an iPhone 5 and I saw the Verge's piece called iOS Darkroom and it had some good suggestions. #1 being VSCO Cam. I have used it and I like to snap pics and edit them on there. The only parts I leave out are vignette and grain as I think that takes away from the photo most of the time.

Is there anything in the piece that was not covered? Any app that is a MUST have that can be used to shoot the photo later to be edited by VSCO Cam? I am open to suggestions. I will even spend a little cash on one. Thanks!