Bottom line is, The object of this hobby is to create the optimal environment for the species we wish to keep. Not to create an environment for the species that suits our budget. If you have the time, resources, and money to set up a proper SW system, and you are willing to put at least a year into proper research before you even put the water into the tank, the go for it, start the research and see where it takes you. By the time you are done, you will have considered and reconsidered several options, but in the end, you will have the knowledge to put together the type of system you want, and the know-how to keep it healthy. If you think you can just throw something together that suits your budget, and ask questions later on how and why things are going wrong, then I highly recommend that you save your money and stick with freshwater. Too many Folks try their hand at this side of the hobby without understanding that it is alot of work. Ultimately, they spend far more than they expected, their systems fail, and they end up selling off all of their equipment at a fraction of the cost. The only thing gained is an empty wallet, and frustration.
If you are willing to put in the time, effort, and money, required to succeed, then you have my full support.