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Wasyoungonce : a good cheap SCT crayford is the GSO unit, it costs $139 from memory, and has 10:1 dual speed reduction for accurate and precise focusing.
Understand, the longer the focal length is, the harder it will be to focus, your C8 with a 2x barlow has a focal length of 4m, it will infact be a bit longer or shorter than this due to the distance between the barlow lens and the CCD, Ash's 8" newtonian with a 3x barlow is ~3.6m focal length, again, give or take a bit due to distance from the lens to CCD.
Your images are a very good start also, you must never be discouraged with early results.. Look at their upsides, and where you can improve, rather than comparing them to other peoples images.. Thats my advice..
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