"Jane's World War II Tanks and Fighting Vehicles: The Complete Guide", by Leland Ness, HarperCollins, 2002.
I have not seen anything better in a single volume.
Edit: Bugger. This now seems to be out of print, and people are demanding absurd prices for it -- Alibris UK doesn't have a copy, Abe UK have one for £50, and the ony re-seller on Amazon UK is asking £177, which is just silly. Arrrrgh.
If you go into Waterstones bookshops I have often seen the type of thing you might be interested in. If all waterstones are set out the same they will be in the Military History but they tend to be in the rotating stand thingy.