Minnow,
You already have half the battle won!!, I was told after I purchased my houseboat that I should have found a marina first and found out how big of a boat I could have slipped. I got lucky and found a marina where I wanted to be. How big of a boat are you looking for? If you are going to live aboard it has been said nothing less than 50+ feet. I don't think I could live on anything less than 80 feet myself.
Just remember to protect yourself, make sure you get an accredited surveyor, and make sure they look out for your best interest. It is well worth the money to have them survey the vessel and give you a report. It could save you thousands in the long run.
Also, Check out the Pirates site, he has some nice boats. Also go through the Houseboats for sale on
www.Houseboatingworld.com. They have alot on there almost way too many to choose from.
Let us know what happens and what you decide to go with.
Kerry