Hi!
"Stalingrad" is OK. The original 1959 b/w "Die Brücke"!
The 2008 color remake is OK but the old one is better!
"Der untergang" also worth seeing!
Not specifically war films but good are "Napola" and "Sophie Scholl",
worth seeing too is "Die Fälscher" from 2007 (The Counterfeiters).
There are a lot of postwar German war films made in the DDR,
but they are very propagandistic...
That should keep you busy for a while
waleed