Here is my feeling:
1: Given the right equipement could you not recreate just about any photo you see in a magazine?
Composition, lighting, and portraying emotion are the skills that seperate the top photographers from the good ones, in my opinion. Perhaps with enough attempts I could get a result very very similar to a shot in almost any magazine. Some photos would take less time than others - oftentimes I see photos in magazinesthat I think I could recreate easily. However, some of the great photographs would be hard to. I mean... looking at the picture and recreating it yes I could probably. But if I was in the same position and had any gear I wanted I don't know if I could recreate the picture without seeing it first. What I am trying to say is that recreating a photo is possible, but getting the photo to have the impact that the original did would be difficult without seeing it first.
2: Do you ever look at a photo you like and say to yourself you could take one like that. NOT THAT YOU COULD TAKE ONE BETTER, just that you know you have a good grasp of what it would take to recreate that particular photo?
Yes. There are a lot of photos I think I could recreate, but then again there are a number of photos that I don't know if I could or not.
The thing that seperates the good pro photographers from the great ones is the ability to consistently perform well. A photographer for national geographic will have to go on an expedition and he has to get amazing photos. He has to do this repeatedly. The magazine knows that when this guy goes out he will come back with results. Some other photographer might produce a quality image once in a while but he can't consistently put out stunning results.
Like sports illustrated - a lot of the photographers must get "the shot". Sure, an amateur might get a better one once in a while, but on the whole the images that the SI photographer returns will be better than the one the amateur does, and that is why he has the job.
(This is all speculation, but I think it should be correct. Maybe SI photographers actually don't get very many good images... I dunno.)
Good question by the way.
P.S. Although you could recreate the photo, if you were stuck in that situation where the photographer was, would you have a good enough grasp of all the key elements of photography to produce a stunning image? What if you only had a few seconds to get the shot?