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Peter, for the longer focal lengths, I'd suggest the larger pixel models, either the 294 or the 533. Your 80mm might get a little resolution anxiety, but it'd be decent enough.
From a practical point of view, the 533 looks pretty good in that it doesn't suffer from amp glow or any ugliness that might hamper calibration for long exposure deep sky imaging.
The 183 is popular and has well known horrific looking amp glow, but it tends to calibrate out pretty well.
The 294 had a bit of a bumpy start with some colour cast issues reported elsewhere, but it's a popular choice and it'd be worth getting some feedback before choosing this one.
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