I found what I consider to be the perfect soft-side case for the C80ED (or any refractor of this size) - the Hakuba PSTC 100 tripod case
It's a touch long for the C80ED, but that leaves extra room for end padding, or leaving some accessories (such as a camera) attached while in the bag. The finder, and included diagonal/eyepiece also fit nicely in the side pouch. The price is reasonable too - about $36.
Here's a shot of my C80ED in the case:
Edited by evan9162, 10 October 2014 - 09:00 PM.