I buy new scouts every season (+always go for top recommended players, but got offered goalie four times in a row...) and the good ones tend to show up as a replacement for the first picks - so it is a bit costlier to fill up the squad with meaningful players (I would not buy defenders with PK SA...)
And I always power train fast nordgens for STs with one-on-one + defenders with wall and heading SA - almost impossible to get a decent scouts with these SAs.
It is also very good to see what the principle skills for the player with particular SA are - I would not recommend to buy shadow striker with low finishing and shooting skills (sure you can now train that but its costly).