Agree with Notes ...
You could use a separate Note for each next action context as well as one for a Projects list, Someday/Maybe, etc. It's a pretty good little app.
I personally use OmniFocus and while the desktop app has a learning curve the iPhone app (though more expensive than Things) is really straight forward.
Another idea but I'd start with a simple app or one you spend the time to learn so then you can focus better on the GTD methodology (much more important than the software selection).
Mark
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