I read one of your further posts about having a Lionfish, that would limit your choices severely in the future since they are incompatible with a lot of other fish. Why not get a tank with a two or three Tangs, Angelfish and Butterfly fish, you'll have much more movement and colour. If you want a monster look how big some of the tangs get. As for the ich and marine velvet parasite problems most people in the saltwater hobby inevitably run into there is a cure all for that called Cupramine for externals and PraziPro for internals, a benefit of not having live rock, coral and inverts is that you will be able to treat your display tank directly..
As for the aquascape for a fish only marine tank you'll want to get Pukani dry rock, live rock and live sand is a waste of money in my opinion, especially when you have a large canister filter to start with, bio balls are actually superior at harbouring the nitrifying bacteria.