I have an SX 694 camera - it is a great chip and the 814 looks good as well. Can't comment on Atik vs QSI.
a few general comments though:
- watch the weight, the last thing you need is ~2kg hanging off the end of an ED80 focuser.
- the small pixels of the 814 would be great for your short-ish scope, but bigger may be better if you later get a longer scope.
- don't get tied up in cooling comparisons - the Sony chips don't need much (mine is still very quiet at 0C if need be)
- an 8 position filter wheel is a great idea - but watch out for the weight
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