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Most objects won't come up in colour without a long exposure, so a 'live view' USB eyepiece in a 8" Dob will give you black and white images, and the cheap ones are not very sensitive.
I find a 10mm eyepiece really good for planets in my 8" SCT, I have a 5mm planetary TMB as well, but it has to be a good night for the planets not to be fuzzy at that magnification.
My favourite thing at the moment is the WO Binoviewer with the included 20mm eyepieces, viewing with 2 eyes is an absolute revelation, especially with the kids, and at just over $200 shipped with 2 eyepieces it is a bargain.
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