Thought I might weigh into the fray.
Get these, either the D70 or the Canon 300D. The canon is better for Ha and since most nebula are Ha, that should settle it for you. I love my D70 but this limitation does get frustrating.
Now for planetary get the Toucam, I got the uncooled one, but this seems to do a good job as is, still you might want to get the cooled one.
Only other thing you will need is Registax3 (freeware), and photoshop (not free) and later either the wedge or my field derotator
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Astrophotography will get you in and you will end up spending more and more money. But the enjoyment is really worth it. And besides its not like buying a fishing boat is it?
Best of luck