RE: MT-5 gotta haves???
IMO use the plastic parts until they break/fail/tear. Perfectly good, why spend extra money and those bits will just be thrown aside? The plastic parts are pretty tough, and can be repaired with a bit of CA and CF rods. So they'll last a good while. Only time I've had plastic failures is when the car went into a curb, splitting A arms. Still usable until it fails, wheras alloy would bend/snap.