Chip - unless you're a "techie" (an optical and or mechanical engineer, etc.) I have to agree with "starman" --- not all that much we the "average observers" can do to improve the optics. They have stood the test to time --- how many years has Celestron been making these C8's now - 50 years.??? I think they have pretty much optimized the optics (for the $$$'s) --- you're not going to get much more out of the basic system they sell.
You WILL get better optical performance with (better than supplied) diagonals, eyepieces, focusers (like FeatherTouch and or MoonLight), etc. and you don't need to be a 'rocket scientist' to do so. And these are very real optical improvements - not just some cosmetic things like adding "colored knobs", etc.