It depends on what you value. I bought cade peninsula 1500 sp with a deal from algaebarn that included live rock, sand, bacteria. It came with plumbing and a sump to house a refugium, a skimmer, and three reactors of a single return pump. It also comes with a built in power station and board as well as a mesh cover. It was more expensive than other systems I looked at but it included so many more things that are prebuilt. If you are a DIY person who wants a system a certain way you can probably save money on other systems, but for me it was a complete system that made sense and saved me what I valued most, time.