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I would grab a 2x barlow and a 15mm eyepiece. It really depends on your level of intrest and devotion and how much you plan to invest in it. For me I would put that whole amount in a 2 inch barlow and it would see many years of use and enjoyment, it would also be ideal for astrophotography work. You could also get a celestron nextimage camera, phillips tucam or eyepiece projection adaptor for a webcam for plantery imaging you could do with your dob. A laser collimator really should be the first thing if you haven't got one.
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