AVTAK : Walken , Jones , Bauchau.......Walken is notorious workaholic though , also I can't really picture him doing cons & meeting a bazillion fans , he seems much too private for that.
But one can always dream
Joseph Wiseman would be the event of the century but I've a feeling he's pretty grumpy and is fed up about Dr No
Bruce Glover wanted 75$ to sign , most fans found it too expensive (he attended Louisiana event afaik)