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Well the longer the focal length, the better everything needs to be. EQ6 as a minimum, and an 8" or 10" newt with a guidescope would be ok on it.
Nothing wrong with an f/4 or f/5 newt for astrophotography - you'll just need a Baader MPCC for coma, and probably to move the mirror up the tube so your DSLR can come to focus.
Just check out the work of Eric (EzyStyles) with his 10" newt on EQ6, or Alchemy with his 12" newt on G-11. Paul Mayo also uses a 12" newt on a G-11. Scott Alder (tornado33) uses a 10" newt on a Samson mount.
Paul and Alchemy (and myself) all have GSO 12" newts. You don't need to spend a fortune on custom optics.
Their work speaks for itself.
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