i have teh skywatcher ED80 and it is a fantastic scope, i wouldn't ask for much more for doing astrophotography. the view is amazing clear, crisp and extremely sharp, easily the best bit of glass i own for my cameras. so a good choice withe scope.
i personally have the skywatcher HEQ5 mount, which is a fantastic mount, but in hindesight i prolly should have got a goto system with my mount. but that is not necessary.
as for your mount, you will most likely be wanting nothing lower than an EQ4 mount. however, you do have to think of the future, if you reckon you'll go with a bigger scope down teh track sometime, you may be wise to look at the HEQ5, which will mount a 6" newt no problems, and possibly upto an 8", if my sources are correct.
either way, happy hunting!
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