I'm playing a 1000 CoD game against Ork player. 4'x4' table. Its a five objective game. One in each of the five buildings. Here is the list I came up with. Feel free to comment:

Librairian + Jump pack (avenger+null zone)
7 assault marines + PF + PP + FL

2x 10 tacticals (PF+MB+Combi-melta) FL+ML + Rhino

Whilrdwind
Thunderfire Cannon