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with an 8" Dob, I've used a 2x and 3x with my 10, 25mm ep's and found the best combination for alot of deep sky stuff was the 25mm + 2x barlow..
This yielded the sharpest, most contrasty image. I would highly recommend a 2x, a 5x would be somewhat overkill, and you would only get real use out of it for planetary viewing on the finest of fine nights...
Erick is right, 5x is really a planetary imaging tool, rather than an observing tool.
Alex.
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