book recommendation needed

[David198502]

hey guys.
once more my girlfriend wants to buy me a book about wwII aviation for my birthday....at x-mas she bought me spitfire on my tail, and i really enjoyed reading it.
now i would like to hear book recommendations from you, and maybe if possible with a brief summary of the content.

what i would really like to read, would be a book which really focuses on the actual air combat.spitfire on my tail is really interesting to read, but this time, i would like to read more about dogfights,tactics and maybe about the technical aspects of the planes(the strenghts and weakness of each craft and therefore the resulting tactics), instead of the overall picture of the period.
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btw, i would prefer books which focus on the evil side of that time.so books about the luftwaffe, their pilots, maybe another biography of an ace.....

thx for your help and information in advance