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Sounds like a good starting setup the ED80 and a DSLR.
I would add that you will want to modify your DSLR or pick up one already modified (the APS sized Canon modded DSLRs are often quite cheap) to pick up nebula.
A standard DSLR will not pick up the Hydrogen Alpha light that well.
Also if you are imaging in the suburbs with bad light pollution you will need a light pollution filter.
Alternatively you can get a one shot colour SBIG camera with self guiding 2nd hand for reasonable cost. It may be too much costwise but it will mean you can do 10 minute exposures. 2nd hand one shot colour astronomy cameras often are relatively cheap as owners decide to upgrade to a mono camera later on and sell their one shot colour. But starting out a one shot colour is easier to use. The new ASI1600C is not that expensive for what it is. Quite an advanced camera.
Unguided it will be challenging to get round stars even at only 90 second exposures. A bit frustrating really. But fun too. Autoguiding is something to add fairly early on. You can also whack a 50mm lens on your Canon and put it on your mount and now you can get good looking images at 90 seconds.
Greg.
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