Sea World is roughly similar in cost to WDW. They also have a new waterpark and an amazing swim with dolphins experience. Do a search for the the Sea World website and it's all detailed there.
Universal Studios is also a great place with two parks and three resorts and a dining/club area. Again I suggest googling their website.
There are also forums dedicated to these place on this website. People who know much about these locations should be able to answer questions. As for more to do, there's beaches nearby, Kennedy Space Center, shopping of all kinds, museums, parks, Gatorland, Ripley's and so on. I would suggest googling a general website about Orlando and the area. (I know, again!)