Happy to see so many people with me on this, however I think a Panther would be nice, or also a heavy allied tank so as...
KV-85
Churchhill
Persing
Or seeing that we have so many allied medium tanks, why not add a bit more flavor to the Axis? Such as...
Panther
Puma(( I know it's not a tank, but it'd be damn fun to recon in this thing with that big ol' gun ^^))