In this WW2 game I have, that is supposed to be historically accurate, it shows that the German forces at the Battle of the Bulge were made up with around 50 Tiger 2 tanks, 250 Panzer IV tanks, and around 350 (Panzer V) Panther tanks.
The Panthers are broken down into Panther D and Panther G. Some 100 other tanks were StuG III, Marders and Jagdpanzers. They also had around 200,000 men but they were mostly Civil Grenadiers and not that experienced.
Also check out a book called ““Nuts” - The Battle of the Bulge”, tons of information. “Nuts” was the one word reply from the American commander at Bastogue, direct to the German Commander’s demand for their surrender.
Link: http://www.tower.com/nuts-battle-bulge-story-photographs-donald-m-goldstein-paperback/wapi/100198280
In that game when you play as the Allies, it always comes down to the Tiger 2 tanks being difficult to destroy. You have to use bombers to soften them up and stress them out, and then you run around them trying to run them out of fuel so they are stuck. Then you use your M4A3 -76mm Shermans and some M26 tank destroyers to engage head to head, and finish them off.
Operation Europe - an older game but quite fun trying the different historical battles scenarios.