I personally do not have any first hand experience on the Rome bindings, but I have heard really good things about the 390/390 Bosses. The 390 is going to be a solid, all mountain binding, similar to the Atlas. I think the Bosses have a canted footbed (correct me if I am wrong someone), so if you're not a fan of cants, stay away from them. I think the Targas are a little stiffer than the 390s, but I'm not too familiar with Rome product, so someone may have something else to say.
Pretty much right on except, the Bosses come with 3 canting options, or 9 (?) if you mix them up for some reason. So you can run them flat if you want.
I prefer bindings with cant, it's been a huge help with knee issues. You can always rig up non canting bindings yourself though.