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314L has about 20% lower QE but pixels have twice the surface area comparing to 428/460, so I suspect 314L will overall be a bit more sensitive, although that is just a speculation since I do not have experience with Atik 314 camera.
I just think with Atik 460ex you get more out of your setup, since is works fine with 1.25 filters and the weight is the same as for the smaller Atik 428ex and it costs extra to move up if you one day decide that ICX 674 is too small (speaking from my experience).
Anyway, Atik 428 and 460 are both fine cameras and it takes skills and experience to make the most of out them.
Good luck!
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