Bull Frog Marina "Lake Powell"?

We are going to Lake Powell in March and would like to rent a House Boat for a week. Can anyone tell me the in's and out's of doing this? We have never been so any info you guys could give me would be helpful. We would like to start out from Bull Frog. If you could help us in finding a reputable rental outfit that wont charge us an arm or a leg for the 5 days we would be most appreciative. Thanks Jeff Brennan (Idaho)