Michael Reynolds has a good series of books about the 1st and 2nd SS Panzer Corps.
"Steel Inferno" 1SS Panzer Corps in Normandy
"Men of Steel" 1SS Panzer Corps
"Sons of the Reich" 2SS Panzer Corps
"The Devils Adjutant" Jochen Peiper, Panzer Leader
Thanks. Dang, my reading list is getting longer instead of shorter!