If you had the chance to meet any of these four, who would be your top choice?

Mine would be:

1. Samuel L. Jackson
2. Ryan Reynolds
3. Jeremy Renner
4. Elizabeth Olsen

In fact, I would not even waste my time meeting Olsen.

Reynolds for me, seems the most fun dude to be around and have a chat with. Jackson would be cool, there aren't many more storied guys in Hollywood then him.
Renner and Olsen are afterthoughts.

1. Reynolds
2. Jackson
3. Renner
4. Olsen

The only reason I chose Samuel L. Jackson as #1 is because he's been in more iconic films and worked with iconic people. He's worked with Tarantino, and has been in some great films. Reynolds would probably be much more fun but he's relatively new and isn't, I don't know ... important enough. He's not really starred in anything that I consider great either. But still much more than Renner and Olsen.