Thanks : ), also Assault squads are too often overlooked, they provide decent firepower against most infantry, highly mobile and are expandable. Bikes don't do nearly as well in CC and cost twice as much for less models.
In a 800 point game today i wiped out a 10 man squad of guardians with wave serpent in shooting and assault, then next turn 5 dire avengers got killed by bolt pistols and by turn 4 they slaughtered a wraithlord with krak assault. I lost three man.
Why 2500 pts? Such arbitrary number.