[Algorithms] View Frustum Culling

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Hi,

I've ported most of my 3D engine to DX8 from DX7 and have come to the point 
where I am going to cull octree nodes against the viewing frustum.

I was using the ComputeSphereVisibility helper function but we all know this 
has been removed :)

I can't quite see how the new Box&Sphere Probe against Ray tests can be used 
to achieve what I want, maybe someone could explain?

What would be the easiest ( if not too slow ) way to do this.

If have 2 main plans

1a) Create a sphere around the frustum and do sphere/sphere tests as a coarse 
cull
1b) then do either cone/sphere or 6 frustum planes/sphere tests 

2) Possibly put AABB vertices in a VB and check the clip flags after 
transformation?

Not even sure if 2 is possible or how to test the clip flags?? 

Regards,

John.