Best site for Keeper Auction large

My league is looking to migrate away from NFL.com fantasy for our keeper/auction league -

Does anyone have good recommendations (yahoo? ESPN?) for an AUCTION+Keeper league?

We typically set it so a player is $7 more to keep every year with no limit on amount of years you can hold…

Thanks!

I have done an auction draft on both MFL and on Fantrax. Both were easy to use and navigate, both are for dynasty. I do think the overall user friendly award goes to MFL though.

We use myfantasyleague.com. it works well. We have to do some manual adjusting of salaries sometimes, but overall, it works well.