If you want cheese, surely allies?Sicarius
Combat squad with Lasback
Predator w/TLLC, LC sponsons, Chronus
And that's about it. I'm a little on the stumped side with this and wouldn't mind some input as to the direction I should take.
I like IG, but cheesier can be found. For example, for 1474 of your 2000 points you can take -
1x HQ: Space Marine Librarian in Power Armour + Combi-Plasmagun
1x HQ: Company Command Squad x4 + Plasma gun x4 + 1x Chimera [Guard]
3x Elite: Dreadnoughts Twin-Linked Autocannon + Twin-Linked Autocannon
2x Troops: Tactical Squads x 9 + Sgt x1 + Combi-Meltagun x1 + Rhinos
1x Troops: Veteran Squad x9 Veteran Squad + Meltagun x3 + Sgt x1 + 1x Chimera
3x Fast Attack: Vendetta Gunship Squadron
Leaving 526 points for other things. I'd field LasPlasbacks over Lasbacks, for example. Now that you can buy the turrets from FW.