Lake Powell Houseboat - advice?

Hello all:

I am looking to rent a houseboat on Lake Powell next Summer/Fall (2011) and I wondered if anyone has any advice on the better company from which to hire or the better marina from which to launch.

Or, if anyone knows of someone that has a houseboat that they rent out, I would be interested in hearing more.

I would be looking into a houseboat that sleeps at 8-12 people with probably two bedrooms and 1.5 baths (combination of kids and adults and preferences for sleeping in own room and sleeping on deck).

I have rented houseboats in various places; however, this will be my first in Lake Powell.

Thank you for any advice, suggestions or information.

Louise

ps: just returned from Da Reever (for those of you not in the know, that is the Colorado River) and introduced two of my nieces and my nephew to wakeboarding