I'm looking at an Octo for my upcoming tank as well, which will be a 120g with a sump/fuge combo. Specifically the Octopus 200 Extreme. Everything I've ready on every forum says they are a good skimmer for the price. A little more pricey than the Coralife, but again, I've been told they're worth it.
I originally had bout a Coralife skimmer myself for a smaller tank, but decided to return it after talking with two different LFS
. I got the impression from both that the Coralife skimmer, while good when it worked, was pretty much a piece of junk to look nice in the sump.
I can't personally vouch for either, but in my research, I can't help but believe that a product that I haven't seen a truly *bad* review of, and countless numbers of users who say it's wonderful product actually know what they're talking about.