Northstar military figures? That'll give access to the Artizan Thrilling tales range, Artizan WW2 & Crusader WW2... Plus related stuff from pulpy/VSF ranges like IHMN...
West Wind has a WW2 range (no idea if it includes Italians, and I believe the figures are a little on the small side), their SOTR weird wars range and the gothic horror range has various Pulp type sets...
Not sure that there is a good 'one-stop shop' for that sort of thing. The best might be Brigade Games over in the states...