Hi Drescher,
IMHO, the "Kriegstagebuch des Oberkommandos der Wehrmacht / Wehrmachtführungsstab" is a must have. The edition from Weltbild Verlag covers the OKW war diary from 1940 to 1945, mostly day by day. The editor, Percy E. Schramm, served as a Major in the Wehrmachtführungsstab and was (at least in 1943) responsible for writing the war diary. All in all, I think it's a good source for a very good price.
Regards
Moonfog