Auto Power will get the job done just fine. I'm putting one in my car and had one in the BMW. It does have it's weak points as far as design goes, but again your not running at speeds over a 100 mph or anywhere close to that on the drift course. For the money that or a Cusco will do you good. Cuscos have the ability to add on to the cages and there just as moderatly priced.
Infact Jarco has TWO Cusco cages on Ebay right now for s13 and s14's