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Fahim, I would look at 2x or 3x televue barlow. Avoid the 2.5x powermate as Mike has said. The important point to bear in mind is that there's a limit to the image scale you can achieve with any given aperture . Over enlarging results in an underexposed image, longer exposures and lower frame rates, all of which reduce image quality. For my C11, the limit is pretty much a 2x barlow and a small extension tube. More than that and I can't sustain 30fps and have a reasonably well exposed histogram. I think a 4x barlow combined with the extra length for your filter wheel and camera will be way too much for a C8.
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