I've previously built two of the 48th scale Tamiya tanks: the M-10 Tank Destroyer and the M1A2 Abrams, and they are great for a non-armor buff like me, both in size (not too big for the display cabinet) and part count (low to moderate, can be built in a week or two).
The M8 Howitzer Motor Carriage was a variation of the Stuart M5 light tank, powered by twin Cadillac V-8s with a 75mm M3 howitzer. Production yielded 1788 units from early 1942 to January 1944, and M8s served in Italy, Western Europe and the Pacific theater.
You get decals for two tanks: 106th Cavalry Reconnaissance Group, operating in Germany February 1945, and 758th Tank Battalion, Fifth Army operating in Italy, April 1945.