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+1 with Martin. Just follow what he says. The EQ6 is a safer bet with an 8" newt as far as stability for imaging. And he will know about the EQ6-pro!
And stay away from the F4 if you haven't much experience with newts.
I'm just about to get an F4 after a few years imaging with an F5 (need for speed). So I'm going to get a quality carbon fibre with a good focuser, and I have the cats eye collimation kit.
But the 8/F5 has been great for imaging over the years, and relatively easy to use. You just need to take care with collimation. Also, you'll need a coma corrector for imaging at F5 - I have no doubts about that.
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