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What type of objects are you planning on imaging? According to my field of view calculator, an 8" f/4 newt with the Atik 420 will give you 1.13''/pixel which is good, but the field of view will be tiny: 30.63' x 23.07'.
Fine for planetary nebulae and small galaxies, but I'd imagine you'd struggle to fit most of the popular nebulae (e.g. Lagoon won't fit, Trifid will be a squeeze) and galaxies (Sculptor Galaxy is 27' long). You'll lose some of the edges of your field of view to dithering and cropping (e.g. drift and field rotation due to polar misalignment).
Something else to consider is that the chip used in the Atik 420 (Sony ICX-274) has a shallow well depth - only 14,000 - which means stars will lose their colour and bloat quickly.
Might be worth checking out some other cameras in a similar price range (or slightly higher) too, e.g. the QHY8L.
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