Also, Ive seen various mechanism proposals...
Which one is correct? Does it matter? I like the second one, personally.
There is never a "correct" mechanism. We can never prove a model, only come up with suggestions. What make one model (mechanism) "more correct" upon others is how much support they got among chemists. And that depends on how easy the model is to be understood and how accurate it proves to be (usefulness).
So what you should ask is what mechanism is accepted to be more correct. And the way you find that out, is by looking up newer litterature (from the last 5-10 years). Try a search on JACS or ISI Web of knowledge.
If you dont have time, use occams razor. The simplest model, is often the more correct one.