My good friend recommended I use 3305s on my H9 Suk (1/3 scale). Just received 9 of them from Tower. They are nicad only and sell for $35 each. He would most likely recommend the JR8411s or the 5050 for your most powerful requirements.
Futaba 3305:
Speed: 0.25 sec/60 degrees at 4.8V
0.20 sec/60 degrees at 6V
Torque: 124 oz/in (8.9 kg/cm) at 6V
99 oz/in (7.1 kg/cm) at 4.8V