Sabaton is one of my favourites as well. Good songs (for me, at least) are 'Midway', 'Wolfpack', 'Nightchild', 'Coat of Arms', 'Cliffs of Gallipoli' and 'Price of a Mile'. These are the one I can yount from the top of my head, but most of their songs are good.
i second it (especially midway and cliffs of gallipoli) and add panzer battalion, stalingrad, attero dominatus, aces in exile, carolus rex, killing ground and poltava.