I'm curious to know why King Camera isn't mentioned in this list. It's by far one of the top all-in-one camera replacement apps along with ProCamera.
I'm a pro photog. I have about a dozen or so camera and editing apps. I got this app from a review made on TheNextWeb a few months ago and I have to say that I'm impressed with the amount of features this app has. This review only touches the surface.
As a photog, just having time lapse, separate focus and exposure, white balance and exposure lock (all even in video mode) is indispensable. Also being able to add my name to the metadata gives me an added sense of security.
2 big features that the review fails to mention is that when you're editing in the Promatik (it's like a mini Photoshop), you have the ability to save a preset of your edits in the Quickmatik for future use. The other cool feature is the ability to copy/paste an effect right in the Photodesk. I haven't found another iPhone that does this. It really reminds me of Lightroom's "sync".
Of all my apps, the apps I use the most are King Camera (it has replaced Camera+ and Photoforge 2), Big Lens, Pro HDR and Pano.