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This list is a small alteration on the list I used to play in 5th edition. I don't know if it will cut it in 7th as I had abandoned orks in favor of tyranids since 6th edition started, but it should hit quite hard.
Second turn assaults should be easy anywhere on the board.

HQ
Big mek, PK, Bike, KFF
Mad Dok
Mek KillSaw

Elite
3 Meganobz
+Battlewagon, Ram, Rokkit, Boarding plank
12 Tankbustaz
+Trukk

Troops
16 Boyz+Nob PK, BP
17 Boyz+Nob PK, BP
10 Grots
10 Grots

Fast Attack
3 Warbikers
2 Warbuggies TL Rokkit
1 Warbuggie TL Rokkit

Heavy Support
5 Lootas
Battlewagon, Ram, Rokkit, Boarding plank
Battlewagon, Ram, Rokkit, Boarding plank

Lord of War
Ghazghkull (warlord)

Ghaz goes with the boyz.
Grotsnik gets the MANZ
Mek joins the boyz
Trukk hides, bikers hide behind the wagons and so do the buggies.
Point and click.