Now I know its bloody unlikely, But since you ask and I want, here are some Id love to see.
Matilda; Was a sweet British tank that could give a PZR4 a good run
Stug III; Mid to late war, a good sterdy lil tank killer
King Tiger; Would have to be a 90+ perk tank But would be fun
Churchill; a perk tank, not as expensive as the tiger 1 thoe
M26 Pershing; Perk tank thoe not as expensive as the Tiger
Hummel or nashorn; We need Arty in the game and thies or the M7 are good ones to use.
Sherman; thoe not the best make it low EMY and no cost and it can swarm as thay had to any way. Or the super Sherman as a rivle to the Panzer.