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It sounds like you have Newt and collimating experience Bill, so that should put you in good stead. Might be worth waiting for comments from F4 Newt owners that image. I find my 8" F5 is a very nice imaging platform, but I do have vignetting issues and would love the extra FOV F4 affords. If you get one of the newer imaging newts with baffles and bigger secondary you should be off to a good start.
I do need coma correction (MPCC) at F5. I believe collimation, tilt and spacing are much trickier to get right at F4 and below. Higher quality focusing gear and adaptors/screw connections may be necessary.
What sort of guiding solution are you contemplating?
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