Dan, I'm sort of in agreement, but any new Iwaki purchases are going to be lesser quality. At one point there was a big shakeup in the Iwaki company and a few of their engineers and designers left. Subsequently, they formed a new company, but it seems Iwaki quality suffered. Previous purchases (like a 12 year old Iwaki) will run for a good long time.
Currently, my preferred pump is a Reeflo. The hybrid series are nice for their flexibility. Creepyoldguy, I have a dart/snapper hybrid. It's just a different impeller (takes about 2 mins to change out) that pushes a lot less water. Maybe investigate that option.
Shoot an email to
sales@premiumaquatics.com and see if they can get you set up. Jason and Jeremy are great about answering questions.
Otherwise, if you are set on submersibles, a pair of a Quiet One 6000s give nice redundancy and they pump well. I have a single 6000 on my 120g, and a 4000 for my 90g.