The ARB is quite heavy and protrudes a good ways from the front of the GX. IMO the ARB looks great on an 80 or 100, but it is not my favorite on a GX. The Coastal requires assembly, so unless you can weld yourself, the all-in price will be quite high (fabrication, sandblasting, powder coat). The Coastal also uses extensive amounts of 3/16" plate, so it too is a heavy bumper (though still lighter than an ARB). It is however, IMO, a good-looking bumper.
I personally have an Ascend with is super-light and has excellent approach angles, and can be bought pre-welded or as a kit. Otherwise, I've always like the look of Demello bumpers on the GX as well.