sajer's is a brilliant book mate, but I now regard it more as a fine novel than a memoir.
I'd say try not to be tempted by Guderian or Manstein's 'memoirs' as I found them deathly dull.
Skorzeny's are worth a read though as a tale of Nazi 'Derring do'.
In case you're interested in more general military memoirs rather than just 'enemy' ones I'd seriously recommend Col. David Hackworth's -
'About face'; (at least it's 'other side of the pond
) only a tenuous link with WW2 as his career only just begins in the closing days of the war and it mainly focuses on Korea and vietnam. He's controversial in certain quarters as one of the US's
most highly decorated soldiers who turned against the war but he really does write a rivetting tale of military life. His descriptions of actual combat have immense atmosphere.
I rate it as one of the most interesting books relating to war, and more importantly 'warriors' I've ever read, and you can find it's bulky form cheap in 2nd hand shops quite easily.
cheers,
Adam.