Just for fun, what would people like to see?
For me my top five would be:
1/ Wars of Belisarius/Narses- or Belisarius to Heraclius (Early Byzantine)
2/ 1066 and All That (It's must is it not? Maybe starting in Late 1016 with Knut's invasion of England? Ending with the Harrying of the North)
3/ The Italian Wars (would need Massed Pike and Medieval Phalanx strengthening?)
4/ Thematic Byzantines and Enemies (A mighty tome!)
5/ Burgundian Wars