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I have been doing some research on them as well. My needs are somewhat different, but I guess the idea is the same. it seems to me you'll have to try them, there are many small differences that matter. for example wfsections seems it could work very well, but doesnt use notifications for example (yet at least). is this important? well, it depends a lot on your use, for me it was.
I started trying wf-sections and AMS, that seemed the best fitted for my needs, and I think could work for you too. Its quite hard to try them all, but worth it IMO. I will likely end up using weblinks instead of them actually, but this is for my special needs.