The price PER Boat varies widely, Depending on Hull, and hardware and engine you put in it, you can go from 800-1500 very easly.
Best bet before you buy a boat, or any boat, go out and watch them and see them run in water conditions, decided then what hull works good in the water your going to run in. A boat may handle well alone out there, but if you get others making waves, it can change the whole attuide of the boat.
Cats what i have seen, is the AC blast cat is a good rough water cat.
If you get a race cat hull, it may get alittle hairy in rough water.
Tom