Hary Potter

[RedSoxTobster]

Hi,
I am a young collector who would like to start expanding my Harry Potter collection.
I currently have:
Granville Saxton, Harry Melling, Hazel Douglas, James and Oliver Phelps, Jim Broadbent, Jim Kay (Illustrator), Kate Fleetwood, Thomas Taylor (Illustrator), Timothy Spall, Toby Jones, Verne Troyer and Zoe Wanamaker.

Who are the best people to write to next, I would like people who are atleast slightly well known, have signed stuff TTM (recently), and are good people to "start" with.

Any suggestions?