20mm and/or 1/72nd and/or 1/76th
Scale Creep carries Fantassin
Minutemen carries SHQ
MMS in England makes really nice 20mm white metal vehicles.
Age of Glory Miniatures carries Xan figures…look rather nice.
Scale Creep carries Warmodelling Naps
15mm/18mm American Civil War
Big honking discussion thread at Lead Adventure Forum
Syrr Hobbs carries Elhiem Moderns.
Under Fire Miniatures-Sculptor for Empress working in 20mm.
The Model Warrior’s excellent article on various manufacturers of 15mm WWII terrain for Normandy.