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I have a 1990's C8 and recently bought a used ED100. I set them up side by side and the C8 blew away the ED100 completely. Yes, the refractor is a bit sharper and has a bit more contrast but the C8 has twice the aperture and four times the light-gathering ability. I traded up the ED100 to an ED120 and it's a lot closer to the C8 in performance but the C8 still wins.
Cooldown is usually only an issue if you take the C8 from a heated home outside into the cold or from an air conditioned room outside into a warm night.
You can get either a C8 or ED100 for around $600-$800 used and get your money back if you sell so I recommend this rather than buying new.
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