A cheese army I used to play is :
I did a quick cheesy 1500 Points marines army the other day just for fun the army list is as follows:-
Headquarters
Commander
w/ Bolt pistol& ccw.
Elites
Dreadnought
w/ Assault cannon, rocket launcher, extra armour.
Dreadnought
w/ Assault cannon, rocket launcher, extra armour.
Dreadnought
w/ Assault cannon, rocket launcher, extra armour.
Troops
5 Scouts
Snipers
5 Scouts
Snipers
Fast attack
3 Landspeeder Tornadoes
3 Landspeeder Tornadoes
Heavy support
Predator Annihilator
Lascannon sponsons, extra armour.
Predator Annihilator
Lascannon sponsons, extra armour.
Predator destructor
Heavy bolter sponsons, extra armour.
Adds upto 1499 if i recall correctly, the downside the the army is that it's minimum troops massed vehicles, but if you ask me that is space marines main strength their versatile fantastic vehicle selection. But the army above is pretty much anti-everything.
Have fun