The Brian L Davis 2 volume set (about $40) and the Angolia 3 vol set (OOP and pricey I guess around $300 now?) Progers 2 vol "RAF vs. Luftwaffe" is allright, but you're paying for RAF materials that you might not want and the beat condition of a lot of the pieces photographed is a turn-off. I never bought a copy.
Angolia gets into the details. Of course, no reference book will tell you everything you need to know. That's a matter of hands-on inspection, and discussion with knowledgable collectors.
I believe Davis is "Uniforms and Insignia of the Luftwaffe". Also, an excellent photo reference, although not entirely related to the Luftwaffe, is Kurtz' latest volume on The Afrika Korp. Naturally Kurtz' book on German Paratrooper has great photos and references if the fallschirmjager are of interest. Along the same line is Chris Mason's book on the Fallschirmjäger as part of the Soldat series.
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