Return of the Ork horde?

I've been trying to decide what to play lately. I've played the same stuff so often that it's getting boring.

I've tried mixing up some Orks and CSM but so far it's meh. I could bring out the Air Armada again.

or

could the Ork Horde have much of a chance?

When I say horde, I mean 180 boyz able to Waagh! every turn.

Yes that means filling all 6 boyz units to the max in the decurion.

Great Waggh! Band

Core:
Warboss: 'eavy armor, Super Cybork, PK
Mek, Killsaw
30 boyz, nob w/pk, 3 weapons
30 boyz, nob w/pk, 3 weapons
30 boyz, nob w/pk
30 boyz, nob w/pk, shootas, 3 weapons
30 boyz, nob w/pk, shootas, 3 weapons
30 boyz, nob w/pk, shootas, 3 weapons

10 grots
3 nobs, 'eavy armor, pk

Aux:
Kannon
Kannon
Kannon
Lobba

That's it. Just fill the board with bodies moving as quickly as possible.  Knights? They will fuck me up.  Anything else though and I might stand a chance.

Besides there is always the mental block of seeing 180 models on the board to kill :)