Hi Jeremy,
If your budget can include one or two quality eyepieces that would be good. The classified section here often has a selection of good ones. If you know what stock eyepieces are supplied with the scope, then you could complement these with one really nice one.
In my experience with an 8" dob using a Telrad rather than the supplied finder scope was much easier. These are around $80 new I think? Also worth investing a little in collimation equipment - this isn't hard to learn, and makes a significant difference to image quality with any reflector. I'm sure others with more knowledge could recommend the best way to go here.
Cheers
Stephen
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