Good 3D clouds

[Michaelj]

I'm having a hard time getting a good set-up to produce volumetric 3D clouds the camera can fly through--it's pretty frustrating trying random settings out as they take so long to render. Can someone provide me with the settings that would at least get me off to a good start, or perhaps
(even better) arrange to send me a sample max file? Any assistance would be really appreciated--thanks!