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Hi Niko,
simplest way, providing you have a mount that will handle the increase in guiding accuracy needed is to try using a a good quality 2xs converter or barlow. (longer exposures though)
Next, and getting into a larger cost area, acquire a larger aperture scope. You might have to upgrade your mount!
Another way and maybe counter productive, a smaller chipped, astro dedicated ccd.
BUT, all that aside however, with digital imaging, with what you have, take longer and heaps more exposures, stack them. This will help reduce noise, increase signal and make things easier to find a good balance with stretching and processing to reveal the data that is hidden.
Spend all night on the one object.
The above I mention because with your image of the Tarantula, it lacks all of these things. This area of sky is chock full of very interesting little knots and twists of nebulosity and star clusters etc. Also work on your focus, take your time to get it right.
If your not sure, ask some of the DSLR imagers on this site for some help with your processing and any other advice.
The Ed 80- Orion/ Celestron/ Skywatcher are very capable little scopes and have produced some very fine images from various people, with various cameras since their arrival on the scene.
I'm sure you will find the wider field you have with the ED80/ 350d as is, will produce some pretty pleasing results with many DSOs.
Above all, have fun, it's a learning curve worth the time and effort.
Hope this helps.
Rich
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