Hi Steve, what do you mean by a "Standard filter", I've never seen a Jewel 180 so forgive my ignorance. Is it a canister filter or hang-on-back filter?
Are you going to have a fish only tank or are you going to have live rock as well?
Whatever you decide, please do research the types of fish you want before you buy them and add them to the tank, you need to be aware of things like minimum aquarium size (some fish grow very big), feeding requirements, habitat (does it live in sand, like some wrasse do), compatibility (some fish are very aggressive, both with their own kind and/or other fish).
You will need an additional pump or two inside the tank to provide water movement, as in the ocean there is big water movement all the time with things like waves, swells and currents, unlike most fresh water fish that do not need pumps inside the tank.
If you have a 4" deep sand bed and live rock then that should deal with most of the filtration needed, but if you're going to stock the tank with a lot of fish then you may need to look at getting a protein skimmer some time down the line to assist in keeping the water clean.
Let us know what you've got in mind and we can help you out with better more direct info.
So to sum up, depending on the filter you have, what you will need initially are two additional pumps/powerheads for inside the tank and some sand and saltwater (both of which you can get from a clean beach at the Bluff).