betterbidding.com will help you identify the hotel. PL will probably give you a lower rate but Hotwire will let you book a room guaranteed to accommodate 3 or 4 guests and will list amenities. A free breakfast may justify paying a little more.
Here is a link to the page with the possible hotels you could get on hotwire. Just scroll down til you see Lake Buena Vista.
http://www.betterbidding.com/index.php?showtopic=67&