Following on from the Tiger and Firefly in Normandy I would suggest that the following would all be useful (especially for the Wargames crowd) in 1/72 Regular and maybe Duplex Drive Sherman, M5 Stuart, Churchill, M3 Halftrack, 6 pounder AT Gun, 17 Pounder AT Gun, 25 Pounder Field Gun, Priest/Sextan SP Gun, Kangaroo APC, M10 Tank Destroyer, Humber Scout Car, M3 Scout Car, Greyhound Scout Car, DUKW, New Infantry Panzer Mk IV, Panther, Sdkfz 251 Half Track, Sdkfz 234 Armoured Car (with variant options), Sdkfz 222 Armoured Car, Pak 40 AT Gun, Marder Infantry Gun/Tank Destroyer, Hetzer, Jagdpanther, New Infantry. After that you could look at Eastern Front, the Western Desert/Italy and Pacific as well as later war options like the Comet, Pershing, and M36 This would take several years to complete