First, welcome to the Cafe Joe! Pull up a chair, grab a cup of coffee and stay a while......
The best free site is FleaFlicker
. They have a fairly easy configurable site with a pretty friendly user interface and live scoring. I haven't had a single issue with their site crashing or scoring problems.
The best pay site, by far, is www.myfantasyleague.com
. One of the best things about MFL is the ability to setup and configure your league site without having to pay a dime. You can create/format your leagues interface by adding tabs, modules, links, etc. to your league's home page. The cost is $69.95 per league and while it's a bit costly, they are by far the best host site for Fantasy Football.
Hope this information helps.