Meeting the Halls (Ryan, Sara, and Chad) was really cool... they are great people and it was awesome talking to them for a while.
Shalane Flanagan is also another one that I talked to who was also great. And, a top tier runner for her age group, Jordan Hasay, was also another great person to talk to... very gracious and humble/mature. Basically, pretty much most of the runners are good people... the ones that stand out to me being Halls, Flanagan, Hasay, Barringer.
To list all the pros/top runners I've met: Shalane Flanagan, Shannon Rowbury, Halls, Jordan Hasay, Mottram, Lagat, Abdi, Kim Smith, Chetelat (top college/HS runner), Babcock, Fernandez, Teg, Wheating, Rupp, Clarke, Kipyego, Willard, and Barringer... there might be more but those are the ones off of the top of my head.
It helps living near Stanford ;) (Cardinal Invite, etc)