Ranlexus, I know you were thinking about my 1260. I had it on my 60gal cube for a month. I had to seriously dial it back, about maybe 80%-50% total output depending on what i was trying to achieve with regards to water level.
I bought new, when I saw many used 1260s for sale. As sturdy as the eheim brand was, I didn't want the possibility of failure; even if minor.
Just to note, I run GFO, and I use a separate pump for that. That way I can turn it on/off with my controller whenever I wanted to instead of getting it fed directly by my return pump. It helps to keep things separate, so teeing off my return pump wasn't needed. Just a thought.