Instead of the E-170, I'd point you towards the Reef Octopus T90. Cheaper than the RedSea, it has a sump instead of an AIO chamber that can be converted to a Sump-system. It's 48 Gallon display, has a gravity-fed ATO that actually works and isn't cumbersome, comes with a great skimmer, media reactor, and a fairly decent return pump, all plumbing is included, you'd just need to buy lights, heater(s), and wavemakers. Also, the stand is apparently of world-class quality (According to the video below).
Link to tank on BRS Site:
https://www.bulkreefsupply.com/octo-lux-t90-aquarium-system-48-gal-reef-octopus.html
Video Unboxing of the tank and Unboxing/mini-review of the stand: