Cool thread, I really like this idea.
1. Storm and Cyclops - Storm can wipe out a large number of terminators from complete safety, and Cyclops could decimate an entire battlefield, but also comes with the draw-back of possibly getting killed by a stray laser.
2. Susan, Megatron, and Cyclops - Susan can create forcefields around Megatron and Cyclops while they wreak havok on the Terminators.
3. Cyclops, Megatron, Susan, and Yoda - Susan can create forcefields around Cyke and Megatron and Yoda can deflect lasers and with precog has a great chance of distracting the terminators while Megatron and Cyclops destroy Skynet.