To get your DSLR working you could move the mirror up. Yes it would involve cutting the tube and drilling new holes to secure the mirror cell. And most probably require a bigger secondary. That would be a bit sad because you end up with a bigger central obstruction which affects the performance some what.
Video imaging I think is the way to go with Dobs and is what I am going to start doing with mine. Not sure which unit I am going to buy, but I think Mallincam and The Imaging Source units are a step up from the Orion products. The higher end units may give you better results than you are currently enjoying.
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