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Mak- Newt would be my choice as it will have a wider field of view, faster F ratio, no spider vane diffraction, and has all spherical surfaces so would have smoother optical figure . I don't know about vignetting , I assume they have that covered. Sirius Optics carry them for AUD $2000 I think.
That being said I doubt you would see any significant improvement over the 8" F5 Newt with MPCC . Why not fit a larger secondary if that will help with the vignetting.
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