Largest sump/fuge as possible. With my 55 gallon tank, I had ~55 gallons in the sump and fuge. Forget a wet/dry. You do not need those. Get a skimmer that is over rated for the amount of water you will have. In-sump skimmer would work best.

After that, it just depends on what kinda display you are looking for. Reef or FOWLR (Fish Only With Live Rock). That will determine lighting and flow. Not to mention inhabitants.