I would also add the B-17E, for the Early/Mid War arenas, no?
No... As nice as it would be, it's not really important. More of a luxury than a necessity. Like the P-47M. Nice, but more important ones to fill.
IMO:
C200 or G.50 (only need 1 they were almost the same in all ways)
He-111
Vickers Wellington (over 11,000 built, over half of the first 1000-plane raid was made up of Wellingtons)
Ki-43
Ki-44
Sm.79 or Cant Z.1007
Bf109E-7 or E-7n or E-7z
Panzer III (early war, lighter gun, less armor, no skirt over treads, etc) - can sub for multiple others also
Just for what we have right now, I think the hurricanes and the 110cs are in most dire need of remodeling and rechecking of their flight models. These 2 are used very frequently in all sorts of scenarios and setups. It's not that they are more important than fill-in-the-blank, it's just that they seem to get used a lot more.