Unbound lists designed to be competitive are quite hard to give advice on, since you can pretty much say anything...
'Take a Tiggy/Calgar Censtar'
'Take a Screamstar'
'Take a Seerstar'
'Take 5 Flyrants'
'Take two whole
SM companies and watch your opponent cry as game ends on your turn one movement phase'
etc...
The only thing I would say is that you are possibly lacking a true death star? If you want to be truly competitive you will almost certainly need one - have a good look though the battle reports of
NOVA/
BAO tourneys and you will find some
Also, you totally lack any form of Psychic - at 3000 points you will get nailed by a Chaos/Tyranid player.