I'm about to jump (back) into the hobby myself, and I'm curious why you're going with the Hydor filter? They don't have much of a reputation (from what I've been able to find - it's not that they have a bad rep, just very little to speak of), and most people seem to be in love with the SunSun filters. I really want to like the Hydor's myself, but the price and reviews of the SunSun's are hard to overlook.
Good luck on your build!
The reason why they dont really have a reputation is because they have not been in the hobby as long as these other name brands and that makes it harder for them to have a rep since not many people have the filter and write reviews on it unlike the lets say marineland or fluval which have been here for along time and have had many mroe people using them.