sharker:
First of all, unless you have a LFS that has access to Indo-Pacific divers or a personal Indo-Pacific diver you will never be able to get your hands on a Ward's wobbegong. Second, it is not the season for them to be around yet. You won't find one available until around mid-April to early May. Around that time I can maybe get one for you. Just remember that if you have a wobbegong in the tank you won't be able to have other tank mates. It will eat everything in the tank. And I do mean everything.
You could get a banded cat and a epaulette... but once they are around 30 inches long there will be some crowding. An epaulette needs about a 300 itself at maximum length. A coral cat shark won't last long with a banded cat shark around. When they get older and much larger banded cats will eat other tank mates. Chances are your banded cat will eat your coral cat some night when he is hungry.
When doing more than one shark in a tank pick the sharks carefully. Some grow much faster than others and some can't deal with the same conditions as others. My suggestion to you is that if your very serious about keeping sharks, maybe get two Ward's wobbegongs. I can't guarantee you a male and a female but you can safetly keep about three of them together in a 275 gallon at maximum growth.
Anyway you look at it you are talking some serious money in either livestock or filtration. Ward's wobbes are going to cost a ton of money and the filtration to support a cat shark, an epaulette, and a coral cat at the same time will cost a ton of money as well.
My basic tank setup suggestion to you is either 1 1,000 gallon per hour pump or two 700gph pumps just for circulation. A large sump filter powered by a 1,000gph pump as well. A large external protien skimmer. Possibly look at a quad skimmer for more efficiency. 3 inches of live sand bed. Three 200 watt heaters in your sump. You will need two for sure but in case one fails you have an additional for backup. Wobbegongs will die the instant the temperature in your tank falls 3 degrees in less than 12 hours.
Look at $4,000 for livestock and equipment setup costs and delivery of livestock.