For Question 1: Herodotus/Thucydides, Bede/Gibbon, Von Ranke, Annales, Carl Becker, Keith Jenkins, Elton/Carr, Reynolds/Windschuttle and History Wars. I usually end up using between 2-4, depending on the question and the source material. I get a bit paranoid and so try to have a good assortment so that I can choose those that suit the question the best.
JFK Case Study: Schlesinger, Sorensen, Chomsky, Dallek, 'Fog of War' film (Morris, McNamara).
A word of advice, most of you probably know this already but just to make sure nobody forgets: Markers like to see a range of historians in Question 1, so if you're going to focus mainly on 19th/20th century historians such as Von Ranke, Carr/Elton, Marxist history etc, try to have at least one Ancient in there as well. Even if it's just a passing reference.
I personally loathe Question 1, it is the bane of my existence.
Good luck everybody!!!