Hello Sean, the above posts are pretty spot on about an 8"f4 and its coma but depending on what you are viewing the coma may not be such a distraction.
Eyepieces, like scopes, vary in quality v price but that graph is not linear, a $1K eyepiece is likely just 5-10% better in actual image quality than a $500 eyepiece.
I have a some half decent eyepieces if you would like to try something out before buying. You might find that what you have is good enough. I'll PM my mobile number to you. I am in Garran.
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