We used 2" square tubing on Drone637's sami. It looks as rugges as the Sami is.
ZOR'S bumper introductory price is good (and if you don't have the ability or inclination to DIY) grab it before the price goes up. Metal and bending should be close to their price, before welding and fitting.
If you build it yourself, you have more chance to smash your fingers and whatever else it takes to get it right. And you have no problem modifying it for lights, hooks, hitches, ect.