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hi,
have you considered a CarbonFibre RC8 or RC10? that will give you the long focal length and if you use a reducer, you can get it down to an F6 I believe. the CCD67 reducer although not meant for this, works quite well. you just need the right flattener.
As for the mount, why the CGEM? do you know what its raw PE is? I think it is worse than the NEQ6. I'd suggest checking that. you can correct via PEC though but you'll need good PE data.
The G11 family is the next step up and you'll have to see if it fits in your budget.
I'll strongly recommend an OAG if you're not going with the Hyperstar. I have no idea if it can be used with the Hyperstar, but an OAG does away with all the flexure issues of a guide scope.
you'll need a sensitive guidecam. the LodestarX2 is amongst the best around, not sure how the STi stacks in comparison to the X2.
as for F2, it can be challenging and objects rather small. an F4 to F5 is the sweet spot for speed and magnification or object size.
or you could look at a triplet apo and use it with a reducer.
Cheers
Alistair
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