I would go hands down with the larger ehiem, they are significantly more powerful than a similarly rated quiet one.
Everyone who comes over, the first thing they mention is how quiet my sump is.
Are you looking to be involved or commited
A Pig and a Chicken are walking down the road. The Chicken says, "Pig, I was thinking we should open a restaurant!". Pig replies, "What would we call it?". The Chicken responds, "How about ham-n-eggs?" The Pig thinks for a moment and says, No thanks. I'd be committed, but you'd only be involved.