Lets say I have a simple 2 operator FM synth using [osc~] objects. As long as the peak amplitude of the modulating oscilator remains below the Nyquist frequency ( I typically run at 48kHz, so this would be 24kHz), there should be no aliasing. Is this correct? or am i missing something.

Well, it's a combination of the carrier frequency and the modulation depth. As long as the modulation depth isn't high enough to push the carrier frequency past Nyquist, then you shouldn't get aliasing.

Awsome, thanks!