I've had a Waveline DC6000 on my 75g and have been very happy with it thus far. Tank has been running just over 13 months now and I've had no issues but I do need to clean the poor thing. It runs on the thirds lowest setting so the work load is minute; in hindsight I should have run it into a manifold to run the reactor too. I've read some horror stories with this pump but it has been trouble free (probably just jinxed myself). It is relatively quite (Deltec skimmer and MP40s are much louder than it is). At just over a year, I think it's premature to make a recommendation one way or another but hopefully it gives you a little info going forward.