I formed a keeper league last year and it was a blast. We kept it simple and just kept 3 and replaced those with our first 3 picks in the draft. We added two more teams for this year so we went from 10 to 12. I guess what i'm getting at is that you know exactly what you are looking for..why don't you start a new league yourself? You can do the draft here or offline and upload the results to yahoo.
just a thought