Well, just for a test play, I started with Man Utd & bought the following who were all gems in FM15 and got them all on the cheap.
Balanta 3mil
Lucas Romero 3mil
Gil Romero 3mil
Passlack 1mil
A.Zivkovic 0.9mil
G.Barbosa 8mil
Bonazzoli 1mil
Sven Bender 13mil
Could easily sign any of these players for Arsenal, besides Bender all are cheap wonderkids. Bit too easy in a way unless the've all had a downgrade.