The hisoricalboardgaming.com axis minor set looks really cool. Some have proposed house rules for tank destroyers and the Stug or Hummel would be perfect for that (just like artillery but move 2 and cost 5). You can get them in a few different colours too.
In the interest of historical nerdiness, you could use the “light” infantry as Finland troops and the “heavy” infantry as Bulgarian troops because they have Bulgarian helmets. You could use the 38t tanks as the ones that start out in Slovakia and Romania because it was a czech tank. You could use the panzer IIIs as the other tanks that you start the game with, and then use the OOB panthers for future tank builds. That’s really geeky but I am ordering s set!
I’m not sure about the other pieces (105 artillery, armoured car, halftrack, FW190) but they are fun to have I guess.