Several of them look very much the same. I do like Recon, and how Scout looks more like Halo 3's. Reach's was a weird Recon/Scout Hybrid. Scanner is pretty cool, and I would love to have Fetu--I mean FOTUS. Dat horn.
I dont think they could have made Venator look any more like Isaac from Dead Space 2 if they wanted to. Even without the color scheme they picked, the armor itself looks a lot like his elite advanced suit, especially the boots.