At nationals, I wish to meet pretty much anyone. Dave Lavery, Dean Kamen, and the regular FIRST VIPs. I also really, REALLY hope Steve Wozniac is there again, he was there last year, I even put in a request to meet him, but never did.
Other people I wish to see over at nationals: (wishful thinking, I know)
The TSS crew
Other former TechTV crew
Ken Jennings (It'd be interesting to see him come)
etc.