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Assuming your soon to be new 8" is F6, you probably won't benefit greatly from a paracorr at all, so you can funnel the $$ into eyepieces if you so wish..
In terms of focal length of the next EP, you've got a good array to begin with; get some experience at the focuser, work out which of the fl's you use the most; your workhorse if you like..though if you're talking Vixen LVWs it'll probably be 13mm or maybe the 17.
Don't rush in though, and if possible get to a club night where you may be able to try some different EPs..also buy secondhand if possible once you've decided what you want.
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