I would suggest the Squadron/Signal title on the Waffen SS, and perhaps
Osprey's book as well. Squadron's book has lots of pictures and a
centerfold with well detailed color plates, while Osprey's has lots of
text with explanations of the rank insignia system, with corresponding
pictures, and several color plates as well. Squadron's book titled SS
Aromr: A Pictorial History of the Armored Formations of the Waffen-SS
has lots of great pics of not just the tanks, but of the men, and there
are a few pages with great color plates of men in interesting uniform
combos. All of these books can be had for comparitively cheap, as
oppossed to those beautiful coffee table books on the subject. They're
all around $10-$12 and could be found used as well, for under $10.
In fact, here you go.
http://www.hobbylinc.com/htm/ssp/ssp3003.htm
http://www.ospreypublishing.com/title_detail.php?title=Q4255&ser=MAA
If you search the Osprey site for Waffen SS, you'll find all of their
titles on the subject. The one I mentioned will probably suffice, but
some of the others might be more specifically suited to your project.
You can find all of these titles at Amazon too, possibly for less. I
see that there are only used copies of SS Armor: A Pictorial History of
the Armored Formations of the Waffen-SS at Amazon, but they are all
under $10.
Oh, and you might find this site of some use.
http://www.1944militaria.com/waffen_ss_camouflage.htm