Tanks like the Jagdpanzer IV are not worth any perks. Yes, the main gun is the same as the almighty Panther, but the lack of a turret, a slow 23 mph speed, no anti-air what-so-ever, and low ammo storage, and thin armor (yes, thin), it has a very narrow window to be good. Please reduce or eliminate the perk cost.
The T34/85 is a huge bargain and worth far more (HVAP ammo = insta-kill, toughest armor in the game, 32 mph speed, tied for best HE round in the game, etc).
With the amount of damage to OBJ the M4 Calliope can cause, it too is a major bargain. It doesn't pay to take anything else to knock down a town or factory. It is the best tank in the game to use against OBJ. Without question. While its AP ability is lackluster, it does surprisingly well when the target is under 800. It needs a lower perk score, imo.