Dual action bars are probably stronger, but I think that Mossberg is the only company that uses them. They are the only one who advertises them. So I think that they must not make that big of a difference. I don't mind (no rust issues) aluminum receivers on shotguns, especially if I am going to carry them for a long time. I'm telling you, you aren't going to get a better gun for $160, period. It's a smoother action than the Mossberg 535, for some reason, and I couldn't tell you why. Every 535 I've tried is much stiffer than the Maverick or 500.
I've got an NEF Pardner Pump, 24" Turkey model, with an all steel receiver, and it's kind of a heavy gun. It's at least a pound heavier than my friends Mossberg 535 Turkey gun. For a cheap gun, I'd recommend the NEF pump too. I got mine for $180 NIB, camo synthetic stock, 24" Turkey barrel with fiber optic sights, parkerized finish. It has a smoother action than the 535, and a much better trigger. It's drilled and tapped too. I'll admit that it wasn't my first choice, but it was the only turkey gun I could find at the last minute. I've kept it so far, but I've got my eyes on a Knight TK2000 right now, so who knows?