Check out the thread in the classifieds about Zealot leagues. These are 53 man Dynasty Leagues w/ IDP. Very creative rules using fake money for free agents. They are doing alot of recruiting and need about 26 more people for the 2 and 1/2 leagues left to fill.
Very low turnover, out of 144 owners last year, they only lost a handful. That's pretty good for a Dynasty League. Check it out.