Being a drunken idiot I challenged my friend who likes the green lanterns to a dual. I said I could easily beat his all green lantern team with a squad of Manhunters. So here is my dilemma. Manhunters aren't the best pieces. My two choices for armies are as follows:

4 Veteran Manhunters w/ Stunning Blow
1 Manhunter 2.0 w/ Stunning Blow

This is 293 points. The second team:

1 Rookie Manhunter
1 Veteran Manhunter w/ Stunning Blow
2 Veteran Manhunter W/Stunning Blow and In Contact W/ Oracle
1 Manhunter 2.0 w/ Stunning Blow and In Contact W/ Oracle

In contact w/ Oracle here represents the manhunters gaining control of Kyle Rayner's ring.

The only limitation to his team is that they all have to be Green Lanterns (though not all with the team affiliation just known lanterns) and he is not going to use KC Green Lantern.

Is there a better team I can use than these?

Actually, you don't stand too bad of a chance, I'd say. In a 300-point game, he's only going to be able to field so many Green Lanterns. Three tops, regardless of who he uses, and it's likely he might just go with two and load them up with feats. Jordan's Willpower will make it tough to just incapacitate him to death, so it's good that you're using Stunning Blow. I'd go with the second team just because you might need the boost to AV to hit Hal or John Stewart, or the extra damage to help punch through Sinestro or Jade's Toughness.

go with the Vets but add ICWO to as many as you can. You'll need the boost.

To bad you can't use other Green Lantern foes like Fatality and Sinestro??