Dynasty mode: High rated prospects
To get a high rated prospect you do not need to upgrade your scouting report. First, save the game after the season ends. Then, advance to the draft. Draft a player or just go into the second round. Look at the highest overall draft pick, load back your season, and draft that person.
To get a good team without changing the roster before you start Dynasty mode, in your first season sign all of the free agents rated from 80 to over 86 then trade them off to different teams. For example, trade Lindros and Whitney for Hejdux on Colorado.