In 35th military, I went for:
1) M4 High Speed Tractor
2) M1070 plus M1000 HET
3) Israeli Centurion from the 1967-73 wars
In other suggestions, I included a large Japanese flattop for WWII and the WWI British battleship Queen Elizabeth in 1/350th, a B-17 in 1/48th and an F16 in 1/32. I also suggested a Sherman and Panzer IV to go with their T34's in 1/16th.
I didn't wish for a Mack NO in 1/35th because I already have one!