Reef Dynamics makes the best quality equipment I have encountered in the hobby. I have an XRC 500.3 protein skimmer for my 600 gallon system and it is phenomenal. I also have one of their recirculation biopellet reactors and it is solidly built as well. You could drop them from the second story and I doubt they would break. Their support is great as well and you can always get to a human to help if ya need.
They will customize a product to fit your specific system and specs if you let them know what ya need.
Happy to have used them for my skimmer/pellet reactor needs.