The standard cages are all made the same including the main loop with a diagonal and horizontal brace, two rear legs, a forward section that runs across the roof line and down to the floor with a windshield bar and one door bar on each side.  This is made of DOM tubing and is available as a bolt in for USD$830 or as a prefit weld in for USD$775.  The horizontal brace loops back from the front seats slightly.  This brace and the diagonal can be made removable as a $100 option which would also make the horizontal brace only loop back on the driver's side. 

Other options include additional door bars, Petty Bar (a diagonal brace running forward from the main loop to the passenger side foot well), a weld in dash bar, video camera mounts, adjustable seat back brace and others.