The 600 series would definitely fit right in my sump. Water level is perfect for where I run and it would be a great replacement for the Reef Octopus 150.
The VF5000 roller would be nice as it doubles the overflow rate for my tank. I also like that it is 50 micron so does not need to roll as quickly. If I had this I would probably have to trade out the Eshopps sump but then I could finally do my refugium.