In response to the Shermans, yes they had extreme problems with Tigers, and even more so with the Panthers.
The M4A3E2-76 was an up gunned version of the M4A3E2 "Jumbo" Sherman that had an all new turrent cast that, at the time, was one of the only US tanks capable of withstanding shots from a Tiger or Panther with any success. The 76mm was a decent AT gun, even capable of frontal shots to the Tiger (it's armor is not sloped) but not the Panther.
The stories most hear are from the M4A31 crews that had the lowly 75mm CS infantry gun, quite pityful at attacking any of the heavy German iron. The Jumbo Sherman had some engine and drive train componets reworked too, from the extra weight. (it weights about 5 more tons then the Easy Eight!) with almost no speed loss.
Pershings are great tanks, but saw little use in the ETO and is..as we are trying to avoid I guess, a 1945 machine. Besides you can't have a game without a Sherman at some point

I would love to see ANY of the Panther series, but, there would definatly need to be a Jumbo or a KV series to deal with that monster. Funny as it is, every one thinks the Tiger was an upgrade from the Panther, while it's actually the other way around. The 88mm is more than capable but the Panther's 75mm is absolutely awsome.
The Tiger II would not fair to good in Aces High I think. While unstoppable in combat, it's fuel consumption (more then 2 gallons a mile avg) and speed off a good hard road or pityful. It's monster weight and extremely strained drive train allow it to climb hill of 10 degrees or less, and it would probably take the same roll as the real Tiger II did, as a defensive unit.
But if the Tiger II should be used, an IS-2 or IS-3 Iosef Stalin would have to be considered. They were blow for blow, pretty equal tanks.
Btw BigJoe the KV-1 series are NOT late war monsters...they came out around between 1939-1941...when the Germans were still making use of 37 and 50mm guns on the Pz(38) and Pz III series. KV-1's were to Germans as the Tigers were to the US crews. (Legend has it the developement of the Tiger came from the KV-1, as it is well known the Panther series was designed incoperating the armor like the T-34 did; well sloped)
There are three tank hunters that would probably make any US or British crew wet their pants on sight...the Jagdpanter, a Panter based TD with the 88mm kwk (Capable of over 4km kill shots)
The Elefant, easily the heaviest German tank made prior to the Tiger II and Jagdtiger. Also armed with the 88mm kwk it was a scary sight in 42-43.
And the Jagdtiger. The Biggest, most heavily armed armored fighting vehicle of the war. A 128mm AT gun and extremely thick armor. Talk about unbalancing

so... since we're interested in late war stuff here ya go

A note, the Tiger, Tiger II, Panter series and the Pershing had turn in place gear. I believe these were the only ones equipped with the gear to do that during the entire war.
- Jig
IS-2 "Iosef Stalin"
Speed 37.0 km/h
Off Road 10.0 km/h
Rev Speed 19.0 km/h
Body Mass 46.0 tons
Front Armor 174.0 mm
Side Armor 122.0 mm
Rear Armor 72.0 mm
Front Turret 160.0 mm
Side Turret 110.0 mm
Rear Turret 90.0 mm
Top Armor 45.0 mm
Turrent
Traverse Speed 14 degrees per second
Elevate Min -3.0 degrees
Elevate Max 30.0 degrees
Projectile Velocity 800 m/s
Projectile Mass 24.9 kg (!)
Caliber 122
AP Ammo 18
HE Ammo 10
My stats on the Pz VI Tiger II or "King Tiger"
Speed 38.0 km/h
Off Road 8.5 km/h
Rev Speed 19.0 km/h
Body Mass 69.7 tons
Front Armor 195.0 mm
Side Armor 84.0 mm
Rear Armor 92.0 mm
Front Turret = 215.0 mm
Side Turret = 86.0 mm
RearTurret = 86.0 mm
TopArmor = 40.0 mm
Turret
TraverseSpeed 18 degrees per second avg
Elevate Min -7.4 degrees
Elevate Max 15.0 degrees
Projectile Velocity 1000 m/s
Projectile Mass 10.2kg
Caliber 88mm
AP Ammo 44
HE Ammo 40
Pz V "Panther" G
Speed 46.0 km/h
Off Road 12.0 km/h
Rev Speed 23.0 km/h
Body Mass 44.8 tons
Front Armor 122.0 mm
Side Armor 50.0 mm
Rear Armor 46.0 mm
Front Turret 150.0 mm
Side Turret 50.0 mm
Rear Turret 50.0 mm
Top Armor 16.0 mm
Turrent
Traverse Speed 20 degrees per second
ElevateMin -8.0 degrees
ElevateMax 18.0 degrees
Projectile Velocity 925 m/s
Projectile Mass 6.8kg
Caliber 75mm
AP Ammo 49
HE Ammo 32
T-26 "Pershing"
Speed 32.2 km/h
OffRoad 8.0 km/h
Rev Speed 17.0 km/h
BodyMass 41.8 tons
Front Armor 137.0 mm
Side Armor 64.0 mm
Rear Armor 51.0 mm
Front Turret 140.0 mm
Side Turret 76.0 mm
Rear Turret 76.0 mm
Top Armor 24.0 mm
Turret
Traverse Speed 27 degrees per second
ElevateMin -10.0 degrees
ElevateMax 20.0 degrees
Projectile Velocity 853 m/s
Projectile Mass 10.9 kg
Caliber 90mm
AP Ammo 35
HE Ammo 35
British Centurion (Probably the best British tank made during WWII

)
Speed 37.0 km/h
Off Road 10.0 km/h
Rev Speed 18.0 km/h
Body Mass 42.0 tons
Front Armor 177.0 mm
Side Armor 74.0 mm
Rear Armor 70.0 mm
Front Turret 152.0 mm
Side Turret 74.0 mm
Rear Turret 70.0 mm
Top Armor 20.0 mm
Turret
Traverse Speed = 24 degrees per second
Elevate Min -12.5 degrees
Elevate Max 20.0 degrees
Projectile Velocity 883 m/s
Projectile Mass 7.7 kg
Caliber 77mm
AP Ammo 39
HE Ammo 19
[This message has been edited by Jigster (edited 06-29-2000).]